🔍 Read the full analysis: The Tractor Era: What Became Of Farm's Working Animals? on ThorstenMeyerAI.com
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TL;DR
U.S. farm horses and mules peaked at 26.7 million in 1918, then declined to 3.1 million by 1960 as tractors and other machinery spread. The shift freed land once used to grow animal feed and reduced farm employment, while jobs increasingly moved to cities. The horse-to-tractor story is often used as an analogy for automation, but how far it applies to human workers remains disputed.
U.S. farms had 26.7 million horses and mules on January 1, 1918; by 1960, the count had fallen to 3.1 million as tractors and other machinery took over agricultural work. The change reshaped farm labor and land use, and remains a frequently cited historical comparison in debates about whether automation will displace human workers.
The figures in the source report draw on the U.S. Census Bureau’s Historical Statistics of the United States, Colonial Times to 1970, which reproduces annual Agriculture Department estimates. Horses alone peaked at 21.4 million in 1915. Mules continued to increase, bringing the combined total to 26.7 million in 1918: 21.2 million horses and 5.5 million mules.
Tractor adoption accelerated over the following decades. The report lists about 1,000 tractors in 1910, 246,000 in 1920, 920,000 in 1930 and 4.69 million in 1960. Around 1955, its figures show tractors outnumbering horses and mules for the first time: 4.35 million tractors against 4.31 million animals. By 1960, horses and mules on farms had declined by almost 90% from their 1918 peak.
The shift involved more than tractors. Combine harvesters, corn pickers, balers and milking machines also spread. The report says the number of people supplied with farm products by each U.S. farm worker rose from 7.1 in 1910 to 47.1 in 1970. That measure includes people abroad supplied through exports, according to the source.
Land and Labor After the Horse
The retreat of working animals changed both the economics of farming and the amount of land available for other uses. In 1915, about 93 million acres of harvested cropland grew feed for horses and mules, out of 340 million acres harvested overall. The source says that was more than a quarter of the total. By 1960, land used to grow their feed had fallen to about 5 million acres.
Mechanization also accompanied a sharp fall in farm employment. The source reports U.S. farm employment at 13.6 million in 1916 and 4.5 million in 1970, while the overall U.S. labor force doubled. It describes new jobs as increasingly urban, meaning many people had to move to find work. These figures show a major change in the economy, though they do not by themselves establish what happened to every worker or isolate machinery from other causes of employment change.
The history matters because it offers concrete evidence that a major technology can eliminate demand for one kind of work while changing where labor and resources are used. It does not, on its own, predict the scale or timing of effects from current technologies.
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From Fordson to Farm Machinery
Tractors existed before World War I, but the source describes early models as heavy, expensive and better suited to large farms. In 1917, Ford introduced the Fordson. The Henry Ford museum calls it “the first mass-produced and inexpensive lightweight tractor”, designed to meet the needs of small farmers. The museum says it rapidly became America’s most popular tractor. The 100,000th Fordson left the assembly line on February 21, 1920.
The tractor reduced the need to keep animals that required feed throughout the year, even when they were not working. Meanwhile, combines that cut, threshed and cleaned grain in one pass increased from about 4,000 in 1920 to 1.042 million in 1960, according to the source’s historical statistics. The reported figures for tractors come from census counts with somewhat different dates; from 1951, horses and mules were counted together.
In 1983, economist Wassily Leontief compared workers to horses displaced by tractors. The source notes a limitation Leontief himself identified: horses could not vote. The comparison is an analogy about technological change, not a rule establishing how human employment will respond.
Limits of the Automation Analogy
The historical counts document the decline in farm horses and mules, but the source does not give a detailed account of what happened to individual animals. It says farmers generally stopped breeding replacements and the working population aged out; it does not describe a single mass removal or provide a complete breakdown of outcomes.
The employment figures show that U.S. farm work shrank as the wider labor force grew, but they do not establish how much of that change was caused by tractors alone. The spread of other machinery, changes in agricultural practices and economic shifts occurred over the same period. The source also raises examples beyond the United States, including China, Germany and Japan, but the material provided here does not supply comparable figures for those countries.
Modern automation is another open question. The report says John Deere’s 16-camera autonomy kit, announced in February 2025, performs tillage on select large tractors. It also reports China’s claim that about 74% of ploughing, sowing and harvesting was mechanized in 2023. The basis and scope of that percentage are not detailed in the material, so it should be treated as an attributed claim, not a directly comparable measure of U.S. tractor use. The source does not show that current farm robots can perform every task once done by people.
What Farm Automation Can Do
The immediate next step is to distinguish specific capabilities from broad forecasts. The report describes present-day driverless equipment as real but limited: the cited John Deere system handles tillage on select large tractors. Further information would be needed to assess how widely such systems are used, which tasks they can perform reliably, and how they affect farm staffing.
For readers comparing today’s automation with the tractor era, the historical record supplies a sequence to examine: adoption of machinery, changes in land and labor needs, and the creation or movement of jobs elsewhere. It does not settle what will happen next. The report gives no forecast for how quickly autonomous farm equipment will spread, or how many workers it may affect.
Key Questions
When did horses and mules on U.S. farms peak?
They peaked at 26.7 million on January 1, 1918, according to the historical estimates cited in the source report. The total included 21.2 million horses and 5.5 million mules.
How many farm horses and mules remained by 1960?
The report gives a count of 3.1 million in 1960, almost 90% below the 1918 peak.
What happened to the working horses?
The source says farmers stopped breeding replacements and the population aged out. It does not provide a detailed account of the fate of individual animals.
Did farm mechanization reduce U.S. farm employment?
Farm employment fell from 13.6 million in 1916 to 4.5 million in 1970, while the overall labor force doubled, according to the report. Those figures track a broad historical change but do not establish that tractors alone caused it.
Does the horse story predict what AI will do to jobs?
No. It is a historical analogy, not a reliable forecast by itself. The report notes that Leontief identified a key difference between horses and workers: people can vote and influence public policy.
Source: ThorstenMeyerAI.com
