Introduction

For the past two centuries iron has been everywhere – connecting cities, transforming farming, spanning rivers, and enabling industry. Iron is the metal that built the modern world. It’s not the most valuable commodity, it’s not the world’s strongest material, but it became our most important—the metal that made railways, skyscrapers, factories, and modern agriculture possible.

History (1800 – Present Day)

Reader note – for additional information on iron, check out these other articles:

• 20 Things You Might Not Know About Iron – here.
• A History Of Iron In The Ancient Era: From Meteoric Curiosity To India’s Wootz Steel – here.
• A History Of Iron In The Middle Ages: From Japan’s Tatara Furnaces To Europe’s Munition Armor – here.
• A History Of Iron In The Early-Modern Era: From African Currency To Cast-Iron Plow – here.
• A Complete History Of Iron: From The Ancient Era To Today – here.
• A Complete History Of The Metals That Built Civilization: Copper, Tin, Bronze, Iron, And Steel Through The Ages – here.

The British Industrial Dominance (1800-1850)

At the dawn of the 19th century, Britain underwent a dramatic transformation in iron production. By 1800, the nation had become a net exporter of iron, with coke-based cast iron production reaching 250,000 tons while traditional charcoal iron production had declined to a mere 7,800 tons. This shift marked the definitive triumph of coke-based methods, particularly the puddling process, which would dominate iron production for decades to come.

The 1828 invention of the hot blast process by James Beaumont Neilson at Wilsontown Ironworks in Scotland represented another crucial breakthrough. By preheating air before blowing it into the furnace, this innovation reduced fuel consumption by two-thirds and enabled the use of raw coal instead of coke, dramatically improving efficiency and reducing costs.

By 1834, the puddling process had spread widely throughout British industry. Richard Crawshay’s improvements at Cyfarthfa Ironworks, including the use of iron oxide to remove impurities, made the process commercially viable for mass production. Britain’s dominance was so complete that by 1840, the nation accounted for over half of world iron production, with output centered in South Wales, Scotland, and the Black Country. By 1875, Britain still controlled 47% of global pig iron production—the crude iron produced directly from blast furnaces with high carbon content that served as raw material for further processing.

The Railway Revolution (1814-1830)

Iron’s most transformative early application came with the development of railways. In 1814, George Stephenson built his first locomotive, “Blücher,” at Killingworth colliery, using iron rails to haul coal wagons. The opening of the Stockton and Darlington Railway on September 27, 1825, marked a watershed moment, utilizing wrought-iron rails produced by John Birkinshaw at Bedlington Ironworks.

Stephenson’s “Rocket” won the Rainhill Trials in 1829, demonstrating the superiority of iron railways for the Liverpool and Manchester Railway, which opened on September 15, 1830, with eight locomotives all built in Stephenson’s Newcastle works. The railway revolution quickly crossed the Atlantic, and in 1831, the “Best Friend of Charleston” became the first locomotive to pull cars in regular service on an American railroad, built by the West Point Foundry for the South Carolina Canal and Rail Road Company.

Agricultural Transformation (1819-1917)

Iron revolutionized agriculture as profoundly as it transformed transportation. Jethro Wood’s 1819 patent for an iron plow with interchangeable parts in the United States marked the beginning of agricultural mechanization. But it was John Deere’s 1837 creation of an improved plow using polished wrought iron that truly transformed Midwest farming. His design could cut through sticky prairie soil without clogging, solving a major problem that had plagued farmers whose wooden plows couldn’t handle the heavy soil of the American heartland.

Cast iron moldboard plows became widely adopted in American agriculture by 1874. Unlike earlier wrought iron plows, these were heavier, more durable, and could be mass-produced in foundries, making them more affordable and accessible. In Australia, the 1876 invention of the stump-jump plough by Richard and Clarence Smith—featuring a hinged share that could ride over tree stumps and rocks without breaking—proved essential for clearing new farmland.

The mechanization of agriculture culminated in 1892 with John Froelich’s construction of the first gasoline-powered tractor, beginning the era of farming with iron-powered implements. Henry Ford’s 1917 introduction of the mass-produced Fordson tractor revolutionized agricultural mechanization with iron machinery, and by 1954, tractors officially outnumbered horses and mules on American farms, completing the transformation of agriculture through iron equipment.

American Ascendancy and the Lake Superior Iron Ranges (1844-1911)

The discovery of vast iron ore deposits in North America fundamentally altered the global balance of iron production. William Austin Burt’s 1844 discovery of iron ore in Michigan’s Marquette Range began the Lake Superior iron mining era. The 1855 opening of the Sault Ste. Marie canal connected Lake Superior iron mines to lower Great Lakes and eastern markets, making large-scale exploitation economically viable.

The subsequent decades saw the systematic discovery and development of the Great Lakes iron ranges: Michigan’s Menominee Range in 1867, Michigan’s Gogebic Range in 1883, Minnesota’s Vermilion Range in 1885 (the first commercial operation in that state), and most significantly, the Merritt family’s 1890 discovery of iron ore on Minnesota’s Mesabi Range near Mountain Iron, which opened the most productive iron district in American history.

The first iron ore shipment from the Mesabi Range departed in 1892, beginning an era of massive production that would last over a century. Iron ore mining began on Minnesota’s Cuyuna Range in 1903, the last of the major ranges to be developed, with its first shipment following in 1911, completing Minnesota’s iron mining infrastructure.

By 1920, the Iron Range population in northeastern Minnesota exceeded 100,000, with immigrant workers from over 30 countries laboring in the mines. The region’s importance was such that during World War II, the Mesabi Range was called “the iron heart of the nation,” with the United States producing 56% of world iron ore at peak wartime production in 1940.

This American production boom enabled the United States to surpass Britain in iron production by 1896, marking a decisive shift in global industrial leadership that would define the 20th century.

Architectural and Naval Innovation (1850-1889)

Iron’s applications expanded dramatically into construction and naval warfare during the mid-19th century. By 1850, cast iron had become widely used in construction, with buildings featuring iron facades and structural elements appearing in major cities. The Brooklyn Bridge, which opened on May 24, 1883, used iron structural elements and became the world’s longest suspension bridge, demonstrating iron’s capacity to enable unprecedented engineering feats.

The culmination of iron’s architectural possibilities came with the Eiffel Tower. Construction began in Paris in 1887 using 7,300 tons of puddled iron, and when completed in 1889 for the Paris Exposition, it stood 300 meters tall as the world’s tallest iron structure, a powerful symbol of industrial achievement.

In naval warfare, iron transformed maritime combat. The 1862 battle between the CSS Virginia (a Confederate ironclad built on the hull of USS Merrimack with sloped iron armor resembling “a floating barn roof”) and USS Monitor (a Union ironclad with a revolutionary rotating gun turret and low profile “cheese box on a raft” design) at Hampton Roads marked the first battle between ironclad warships, rendering wooden navies obsolete virtually overnight.

Processing Innovations (1861-1930)

The development of new iron processing methods drove continued improvements in quality and efficiency. In 1861, the open hearth furnace process was developed simultaneously by William Siemens and Pierre-Émile Martin. This method allowed iron to be melted in a shallow hearth with flames playing over the surface, enabling better control of impurities and the crucial ability to use scrap iron. Pierre-Émile Martin licensed Siemens’ regenerative furnace design in 1865 and applied it to iron processing in France, and by 1870, the Siemens-Martin open hearth process had been perfected, allowing widespread use of scrap iron and superior quality control.

By 1930, open hearth furnaces had become the dominant method for iron processing worldwide, a position they would hold for several decades. The technology was so successful that it took another 60 years before it began to be phased out in favor of more modern methods.

Electric arc furnaces began being used for specialty iron production as early as 1900, though they would not become dominant in mainstream production until much later.

Global Expansion and World War (1907-1940)

The iron industry expanded globally in the early 20th century. The 1907 establishment of the Tata Iron and Steel Company (TISCO) in India by Dorabji Tata marked the beginning of Asian iron industrialization. By 1939, TISCO operated the largest iron plant in the British Empire, demonstrating the industry’s spread beyond its Western origins.

World War II represented the peak of iron’s strategic importance. In 1940, iron production supported the war effort with the metal used for ships, tanks, artillery, and military equipment. The United States’ dominant position in iron ore production—56% of global output at peak wartime production—proved decisive in the Allied victory.

The war’s human cost was also reflected in iron mining, with tragedies like the 1924 Milford Mine disaster, which killed 41 miners in Minnesota’s Cuyuna Range in the state’s worst mining tragedy.

Post-War Transformation and Technological Change (1950-2000)

The post-war era saw rapid technological evolution in iron processing. Basic oxygen furnaces, which blow pure oxygen through molten iron to remove impurities faster than open hearth methods, began replacing open hearth furnaces in Western Europe in 1950. The same year, taconite processing—crushing and concentrating low-grade iron ore into pellets—began in Minnesota as high-grade natural ore reserves became depleted, extending the productive life of American iron ranges.

Major changes in iron processing technology emerged in 1968, leading to more efficient production methods. The 1970s saw Japan and South Korea emerge as major iron processors using imported ore and modern technology, foreshadowing the shift of iron production to Asia. Basic oxygen processing replaced open hearth furnaces in Eastern Europe by 1980, completing the global modernization of production.

The era of open hearth processing gradually came to an end: by 1989, only 8,200 puddling furnaces remained in operation worldwide, mostly using modified processes. The last open hearth furnace in the United States closed in 1992, ending 130 years of the Siemens-Martin process. The last open hearth furnace in former East Germany stopped operation in 1993, and Romania’s last 420-ton open hearth furnace at Hunedoara shut down on June 12, 1999, marking the end of an era in Europe.

The year 2000 marked another pivotal shift: China became the world’s largest iron ore importer and processor, fundamentally reshaping global markets in ways that would only accelerate in subsequent decades.

The Modern Era: Efficiency, Globalization, and Environmental Concerns (2010-Present)

By 2010, electric arc furnaces—which melt iron using electric arcs between graphite electrodes—and continuous casting—pouring molten iron directly into semi-finished shapes—had come to dominate modern iron production, with sophisticated computer controls enabling unprecedented precision and efficiency.

The dramatic shift in global production was starkly illustrated by American statistics: by 2014, the United States produced only 1.8% of world iron ore, down from 56% in 1945, demonstrating the profound industrial transformation of the past seven decades. By 2020, global iron ore consumption reached 2,046 million tonnes, with China consuming over 60% of production, cementing its position as the center of global iron production.

As of 2023, Australia led global production with 960 million metric tons of iron ore, ahead of Brazil’s 440 million tons. Major mining companies like BHP, Rio Tinto, and Vale operated mines employing advanced technology including autonomous trucks and AI-powered processing systems, representing the cutting edge of mining technology.

However, the environmental cost of iron production became increasingly apparent. Modern blast furnaces were estimated to have been responsible for over 4% of global greenhouse gas emissions since 1900, making the iron industry a significant contributor to climate change.

In response, sustainable iron production methods including hydrogen-based reduction gained traction in 2024 to reduce carbon emissions. By 2025, the iron industry continues evolving with a focus on environmental sustainability and circular economy principles, attempting to reconcile the world’s continued dependence on iron with the urgent need to address climate change.

Conclusion

The history of iron in the modern era is the story of industrial civilization itself. From George Stephenson’s first locomotive in 1814 to today’s hydrogen-based reduction technologies, iron has been the material foundation of modernity. It built the railways that connected continents, the plows that fed growing populations, the bridges and buildings that housed urban civilization, and the machines of war that determined the fate of nations.

Yet, this history also reveals the environmental and social costs of industrial development. As the industry enters its third century of modern production, it faces the challenge of maintaining its essential role in civilization while dramatically reducing its environmental impact. The transition from charcoal to coke to hydrogen-based reduction reflects not just technological progress, but humanity’s evolving relationship with the natural world and our growing understanding of the consequences of industrial production.

The iron age that began in prehistory continues into an uncertain, but critical future.

Chronology

The story of iron in the modern era is one of revolutionary innovations, from the puddling furnace to the electric arc furnace, with each advancement unlocking new possibilities – while simultaneously creating new challenges. As we trace iron’s journey through the past two centuries, we see transcontinental railways, towering skyscrapers, mechanized agriculture, and global wars that, ultimately, reshape society:

• 1800 – British iron production becomes a net exporter as charcoal iron production drops to 7,800 tons while coke cast iron production reaches 250,000 tons, marking the dominance of coke-based methods using the puddling process
• 1814 – George Stephenson builds his first locomotive “Blücher” at Killingworth colliery, using iron rails to haul coal wagons
• 1819 – Jethro Wood patents an iron plow with interchangeable parts in the United States, advancing agricultural mechanization
• 1820 – Iron ore mining begins in Minnesota’s Iron Range region, though commercial exploitation wouldn’t begin until later
• 1825 – The Stockton and Darlington Railway opens on September 27, using wrought-iron rails produced by John Birkinshaw at Bedlington Ironworks
• 1828 – James Beaumont Neilson patents the hot blast process at Wilsontown Ironworks in Scotland, which preheats air before blowing it into the furnace, reducing fuel consumption by two-thirds and enabling use of raw coal instead of coke
• 1829 – George Stephenson’s “Rocket” wins the Rainhill Trials, demonstrating the superiority of iron railways for the Liverpool and Manchester Railway
• 1830 – The Liverpool and Manchester Railway opens on September 15, with eight locomotives all built in Stephenson’s Newcastle works
• 1831 – The “Best Friend of Charleston” becomes the first locomotive to pull cars in regular service on an American railroad, built by the West Point Foundry for the South Carolina Canal and Rail Road Company
• 1834 – The puddling process spreads widely, with Richard Crawshay’s improvements at Cyfarthfa Ironworks including the use of iron oxide to help remove impurities, making it commercially viable for mass production
• 1837 – John Deere creates an improved plow using polished wrought iron that could cut through sticky prairie soil without clogging, solving a major problem for Midwest farmers whose wooden plows couldn’t handle the heavy soil
• 1840 – Britain accounts for over half of world iron production, with output centered in South Wales, Scotland, and the Black Country
• 1844 – William Austin Burt discovers iron ore in Michigan’s Marquette Range, beginning the Lake Superior iron mining era
• 1850 – Cast iron becomes widely used in construction, with buildings featuring iron facades and structural elements appearing in major cities
• 1855 – The Sault Ste. Marie canal opens, connecting Lake Superior iron mines to lower Great Lakes and eastern markets
• 1861 – The open hearth furnace process is developed simultaneously by William Siemens and Pierre-Émile Martin, allowing iron to be melted in a shallow hearth with flames playing over the surface, enabling better control of impurities and the ability to use scrap iron
• 1862 – The CSS Virginia (a Confederate ironclad built on the hull of USS Merrimack with sloped iron armor resembling “a floating barn roof”) and USS Monitor (a Union ironclad with a revolutionary rotating gun turret and low profile “cheese box on a raft” design) fight the first battle between ironclad warships at Hampton Roads
• 1865 – Pierre-Émile Martin licenses Siemens’ regenerative furnace design and applies it to iron processing in France
• 1867 – Iron ore is discovered on Michigan’s Menominee Range, expanding Lake Superior iron mining
• 1870 – The Siemens-Martin open hearth process is perfected, allowing use of scrap iron and better quality control
• 1874 – Cast iron moldboard plows become widely adopted in American agriculture, different from earlier wrought iron plows as they were heavier, more durable, and could be mass-produced in foundries
• 1875 – Britain accounts for 47% of world pig iron production (pig iron is the crude iron produced directly from the blast furnace with high carbon content, used as raw material for further processing)
• 1876 – The stump-jump plough is invented in Australia by Richard and Clarence Smith, featuring a hinged share that could ride over tree stumps and rocks without breaking, essential for clearing new farmland
• 1883 – The Brooklyn Bridge opens on May 24, using iron structural elements and becoming the world’s longest suspension bridge
• 1884 – Iron ore is discovered on Michigan’s Gogebic Range, further expanding Great Lakes iron mining
• 1885 – Iron ore mining begins on Minnesota’s Vermilion Range, the first commercial operation in the state
• 1887 – Construction of the Eiffel Tower begins in Paris, using 7,300 tons of puddled iron
• 1889 – The Eiffel Tower is completed for the Paris Exposition, standing 300 meters tall as the world’s tallest iron structure
• 1890 – The Merritt family discovers iron ore on Minnesota’s Mesabi Range in northeastern Minnesota near Mountain Iron, opening the most productive iron district
• 1892 – First iron ore shipment from the Mesabi Range in northern Minnesota begins an era of massive production lasting over a century; John Froelich builds the first gasoline-powered tractor, beginning the mechanization of farming with iron implements
• 1896 – The United States surpasses Britain in iron production, marking a shift in global industrial leadership
• 1900 – Electric arc furnaces begin being used for specialty iron production
• 1903 – Iron ore mining begins on Minnesota’s Cuyuna Range, the last of the major iron ranges to be developed
• 1907 – The Tata Iron and Steel Company (TISCO) is established in India by Dorabji Tata, beginning Asian iron industrialization
• 1911 – First iron ore shipment from the Cuyuna Range completes Minnesota’s iron mining development
• 1917 – Henry Ford introduces the mass-produced Fordson tractor, revolutionizing agricultural mechanization with iron machinery
• 1920 – Iron Range population in northeastern Minnesota exceeds 100,000 as immigrant workers from over 30 countries work the mines
• 1924 – The Milford Mine disaster kills 41 miners in Minnesota’s Cuyuna Range, the state’s worst mining tragedy
• 1930 – Open hearth furnaces become the dominant method for iron processing worldwide
• 1939 – India’s Tata Iron and Steel Company (TISCO) operates the largest iron plant in the British Empire
• 1940 – Iron production supports World War II efforts with iron used for ships, tanks, artillery, and military equipment, with the Mesabi Range called “the iron heart of the nation” and the United States producing 56% of world iron ore at peak wartime production
• 1950 – Basic oxygen furnaces (which blow pure oxygen through molten iron to remove impurities faster than open hearth methods) begin replacing open hearth furnaces in Western Europe; Taconite processing (crushing and concentrating low-grade iron ore into pellets) begins in Minnesota as high-grade natural ore reserves become depleted
• 1954 – Tractors officially outnumber horses and mules on American farms, completing agricultural mechanization with iron equipment
• 1968 – Major changes in iron processing technology lead to more efficient production methods
• 1970 – Japan and South Korea emerge as major iron processors using imported ore and modern technology
• 1980 – Basic oxygen processing replaces open hearth furnaces in Eastern Europe, modernizing production
• 1989 – Only 8,200 puddling furnaces remain in operation worldwide, mostly using modified processes
• 1992 – The last open hearth furnace in the United States closes, ending 130 years of the Siemens-Martin process
• 1993 – The last open hearth furnace in former East Germany stops operation, marking the end of an era in Europe
• 1999 – Romania’s last 420-ton open hearth furnace at Hunedoara shuts down on June 12
• 2000 – China becomes the world’s largest iron ore importer and processor, reshaping global markets
• 2010 – Electric arc furnaces (which melt iron using electric arcs between graphite electrodes) and continuous casting (pouring molten iron directly into semi-finished shapes) dominate modern iron production, using sophisticated computer controls
• 2014 – The United States produces only 1.8% of world iron ore, down from 56% in 1945, showing dramatic industrial shifts
• 2020 – Global iron ore consumption reaches 2,046 million tonnes, with China consuming over 60% of production
• 2022 – Modern blast furnaces are estimated to have been responsible for over 4% of global greenhouse gas emissions since 1900
• 2023 – Australia produces 960 million metric tons of iron ore, leading global production ahead of Brazil’s 440 million tons, with major mining companies like BHP, Rio Tinto, and Vale operating mines that employ advanced technology including autonomous trucks and AI-powered processing systems
• 2024 – Sustainable iron production methods including hydrogen-based reduction gain traction to reduce carbon emissions
• 2025 – The iron industry continues evolving with focus on environmental sustainability and circular economy principles

Final Thoughts

Iron’s transformation from a limiting factor in human development, to an enabling force for global civilization, demonstrates that even our most fundamental materials can be reimagined for new eras, and, as we stand at yet another crossroads in iron’s long history, with hydrogen-based reduction and carbon capture technologies promising clean production methods, we see that iron’s story continues to evolve – reminding us that true progress lies not just in discovering new materials, but in continuously reinventing how we use the resources we have always known.

Thanks for reading!

References

[1] Industrial Revolution – Wikipedia – https://en.wikipedia.org/wiki/Industrial_Revolution

[2] Changes to Iron Production | History of Western Civilization II – https://courses.lumenlearning.com/suny-hccc-worldhistory2/chapter/changes-to-iron-production/

[3] George Stephenson – Wikipedia – https://en.wikipedia.org/wiki/George_Stephenson

[4] How Did Farming Technology Change in the Past Two Centuries? – https://www.thoughtco.com/american-farm-tech-development-4083328

[5] Minnesota mining history | Minnesota DNR – https://www.dnr.state.mn.us/education/geology/digging/history.html

[6] James Beaumont Neilson | Inventor, Hot Blast, Iron Smelting | Britannica – https://www.britannica.com/biography/James-Beaumont-Neilson

[7] Hot blast – Wikipedia – https://en.wikipedia.org/wiki/Hot_blast

[8] James Beaumont Neilson – Wikipedia – https://en.wikipedia.org/wiki/James_Beaumont_Neilson

[9] Stephenson’s Rocket – Wikipedia – https://en.wikipedia.org/wiki/Stephenson’s_Rocket

[10] George Stephenson | Biography, Locomotives, & Facts | Britannica – https://www.britannica.com/biography/George-Stephenson

[11] 04. Locomotives – Linda Hall Library – https://www.lindahall.org/experience/digital-exhibitions/the-transcontinental-railroad/04-locomotives/

[12] Henry Cort – Wikipedia – https://en.wikipedia.org/wiki/Henry_Cort

[13] Plows of the 19th CENTURY: Revolutionize FARMING! – https://19thcentury.us/19th-century-plow/

[14] Did John Deere’s Best Invention Spark a Revolution or an Environmental Disaster? – https://www.smithsonianmag.com/smithsonian-institution/did-john-deeres-best-invention-spark-revolution-or-environmental-disaster-180957080/

[15] History of the steel industry (1850–1970) – Wikipedia – https://en.wikipedia.org/wiki/History_of_the_steel_industry_(1850–1970)

[16] Iron Range – Wikipedia – https://en.wikipedia.org/wiki/Iron_Range

[17] The vital part coal and iron played in the Industrial Revolution – History Skills – https://www.historyskills.com/classroom/year-9/yr-9-coal-and-iron-reading/

[18] The Pineries (1820-1900) and the Mines (1850-) | The History of the Upper Midwest – https://www.loc.gov/collections/pioneering-the-upper-midwest/articles-and-essays/history-of-the-upper-midwest-overview/pineries-and-mines/

[19] THE BESSEMER PROCESS IN STEEL PRODUCTION 1856 (Va) – https://www.timewisetraveller.co.uk/bessemer.html

[20] Civil War: Battle of the Ironclads: Monitor and Merrimack – https://www.ducksters.com/history/civil_war/battle_of_ironclads.php

[21] Battle of the Monitor and Merrimack | Summary & Facts | Britannica – https://www.britannica.com/event/Battle-of-the-Monitor-and-Merrimack

[22] Open-hearth furnace – Wikipedia – https://en.wikipedia.org/wiki/Open-hearth_furnace

[23] Open-hearth process | Steelmaking, Carbon Removal, Refining | Britannica – https://www.britannica.com/technology/open-hearth-process

[24] Firearms History, Technology & Development: Metals Used in Firearms – XVI – http://firearmshistory.blogspot.com/2014/11/metals-used-in-firearms-xvi.html

[25] Plowing in the Past: A Look at Early Farm Machinery | Iowa PBS – https://www.iowapbs.org/iowapathways/mypath/2683/plowing-past-look-early-farm-machinery

[26] The Steel Industry in the British Industrial Revolution – World History Encyclopedia – https://www.worldhistory.org/article/2206/the-steel-industry-in-the-british-industrial-revol/

[27] Plough – Wikipedia – https://en.wikipedia.org/wiki/Plough

[28] Brooklyn Bridge opens | May 24, 1883 | HISTORY – https://www.history.com/this-day-in-history/may-24/brooklyn-bridge-opens

[29] Brooklyn Bridge – Wikipedia – https://en.wikipedia.org/wiki/Brooklyn_Bridge

[30] Eiffel Tower history, architecture, design & construction – https://www.toureiffel.paris/en/the-monument/history

[31] Eiffel Tower | History, Height, & Facts | Britannica – https://www.britannica.com/topic/Eiffel-Tower-Paris-France

[32] Eiffel Tower opens in Paris | March 31, 1889 | HISTORY – https://www.history.com/this-day-in-history/march-31/eiffel-tower-opens

[33] A brief history of Minnesota’s Mesabi Iron Range – MinnPost – https://www.minnpost.com/mnopedia/2020/05/a-brief-history-of-minnesotas-mesabi-iron-range/

[34] History of Agriculture Equipment: Important Developments and Examples – https://www.tstar.com/blog/history-of-agriculture-equipment-important-developments-and-examples

[35] Bessemer process – Wikipedia – https://en.wikipedia.org/wiki/Bessemer_process

[36] Immigration to the Iron Range, 1880–1930 | MNopedia – https://www.mnopedia.org/immigration-iron-range-1880-1930

[37] Iron mining in the United States – Wikipedia – https://en.wikipedia.org/wiki/Iron_mining_in_the_United_States

[38] The Evolution of Farming Equipment from Plows to Autonomous Tractors – https://www.flextrades.com/blog/evolution-of-farming-equipment/

[39] Day 45/365 of Steel – Henry Cort – SteelExplained.com – https://steelexplained.com/day-45-365-of-steel-henry-cort/

[40] Iron ore: global production by country 2023 | Statista – https://www.statista.com/statistics/267380/iron-ore-mine-production-by-country/

[41] Bessemer Process – an overview | ScienceDirect Topics – https://www.sciencedirect.com/topics/engineering/bessemer-process

[42] Global Consumption of Iron ore, 2017 – 2025 (Million Tonnes) – GlobalData – https://www.globaldata.com/data-insights/mining/global-consumption-of-iron-ore-1092749/

[43] Blast furnace – Wikipedia – https://en.wikipedia.org/wiki/Blast_furnace

[44] List of countries by iron ore production – Wikipedia – https://en.wikipedia.org/wiki/List_of_countries_by_iron_ore_production

[45] Iron: usable ore production worldwide 2023 | Statista – https://www.statista.com/statistics/589945/iron-ore-production-gross-weight-worldwide/

[46] Iron Ore Production | Clio Infra | Reconstructing Global Inequality – https://clio-infra.eu/Indicators/IronOreProduction.html