🔍 Read the full analysis: The Tractor's Impact On 26.7 Million 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 fell to 3.1 million by 1960 as tractors and other machinery spread. The shift freed cropland previously used to grow animal feed and reduced farm employment, while workers moved into other jobs and cities. The episode presents the horse-to-tractor shift as a historical analogy for automation, not a proven forecast of what will happen to human workers.
U.S. farms had 26.7 million horses and mules in January 1918, but the combined count had fallen to 3.1 million by 1960 as tractors and other machinery took over farm work. A November 4 episode of ThorstenMeyerAI.com’s “Work After Work” series uses that change to examine the economic effects of agricultural automation and the limits of comparing displaced animals with human workers.
The historical figures cited in the episode come from the U.S. Census Bureau’s Historical Statistics of the United States, Colonial Times to 1970, which reprints Agriculture Department estimates. Horses alone peaked at 21.4 million in 1915; the combined horses-and-mules count reached 26.7 million on January 1, 1918. The animals supplied farm power for ploughing, planting, harvesting and transport, but required feed throughout the year.
In 1915, an estimated 93 million acres of harvested cropland—more than a quarter of the 340 million acres harvested—grew feed for horses and mules, according to the source material. The episode says that figure remained about 90 million acres in 1920, then fell to roughly 5 million acres by 1960. It describes the land freed from feed production as available for other crops; the figures do not, by themselves, show how much of the land was used for any particular purpose.
Tractor numbers rose rapidly over the same period: about 1,000 in 1910, 246,000 in 1920, 920,000 in 1930 and 4.69 million in 1960. The episode places the crossover around 1955, when it lists 4.35 million tractors and 4.31 million horses and mules. By 1960, the animal count was down almost 90% from its 1918 peak. The source cautions that the historical counts use different dates and that the Agriculture Department combined horses and mules in its estimates from 1951.
Machinery Reshaped Farms and Work
The change was not simply a swap of one kind of engine for another. Animals consumed crops even when they were not working, while a tractor’s fuel was needed when it was used. Replacing animal power altered the demands on farmland and helped raise the amount of food one farm worker could supply. The episode reports that the Agriculture Department’s estimate rose from 7.1 people per farm worker in 1910 to 47.1 in 1970; the latter figure includes people abroad supplied through exports.
Farm employment also fell: the source gives a peak of 13.6 million in 1916 and 4.5 million in 1970, while the overall U.S. labor force doubled. That comparison highlights a major social consequence: work shifted away from farms, and many people had to seek jobs elsewhere, including in cities. The figures establish the scale of the changes, but they do not isolate tractors as the sole cause; other machinery, fertilizer and improved seed also contributed.
The history matters to current debates about automation because it shows that a technology can sharply reduce demand for a particular kind of work while the wider economy changes around it. It does not establish that human workers will experience the same outcome as horses. People can seek other employment and have political rights; animals could not choose a new occupation or influence policy.
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From Fordson to Farm Robots
Gasoline tractors existed before World War I, but the source describes early models as heavy, expensive and better suited to large farms. It says Ford launched the Fordson in 1917 as a lighter, lower-cost model aimed at smaller farmers. The Henry Ford museum describes it as “the first mass-produced and inexpensive lightweight tractor” and says it rapidly became the most popular tractor in America. The source reports that the 100,000th Fordson left the assembly line on February 21, 1920.
Tractors were part of a wider wave of mechanization. Combine harvesters—machines that cut, thresh and clean grain in one pass—rose from about 4,000 on U.S. farms in 1920 to more than 1 million in 1960, according to figures in the episode. Corn pickers, balers and milking machines also spread. The episode cites economist Wassily Leontief’s 1983 comparison between workers and horses displaced by tractors, while noting a difference Leontief himself raised: horses could not vote.
The episode also points to present-day farm technology without describing it as a direct repeat of the tractor’s rise. It says John Deere’s February 2025, 16-camera autonomy kit is used for tillage on selected large tractors. It also reports that China said about 74% of ploughing, sowing and harvesting was mechanized in 2023. Those claims describe different settings and types of mechanization, so they should not be read as evidence that driverless tractors can perform every farm task.
““The ‘peak horse’ argument is an analogy, not a law.””
— Thorsten Meyer, in the November 4, 2026, episode
Where the Horse Analogy Stops
The historical counts show that farm horses and mules became far less common as tractors spread, but they do not explain every cause of the decline or track what happened to each animal. The episode says farmers stopped breeding replacements and the existing working population aged out; the supplied material does not give a detailed account of animals’ individual fates.
It is also unclear from the cited figures how much of the fall in farm employment resulted specifically from tractors rather than combines and other machinery, changes in farming practices, or broader economic shifts. The horse comparison cannot settle how automation will affect human employment: people have different skills, choices and rights, and the episode does not provide a forecast of future job losses or gains.
The present-day examples are limited as well. The source describes a tractor autonomy system used for tillage on selected large machines, but gives no figures for its adoption, costs or effects on farm employment. It does not specify the scope or measurement method behind China’s reported 74% mechanization figure. Those details would be needed for comparisons across countries or with historical U.S. data.
Questions for Today’s Farm Automation
The episode frames its closing issue as how far the tractor story applies to current automation. The immediate evidence to watch is the deployment of farm robots beyond narrow tasks such as tillage, along with whether equipment becomes practical for more farms and crops. The source does not announce a new study, policy decision or next data release, so no specific milestone is confirmed.
Further comparisons would need consistent measures of technology use, farm employment and productivity, as well as clear time periods and definitions. Until then, the historical record supports a measured conclusion: mechanization changed the number and kind of workers farms needed, but it does not by itself predict the consequences of modern automation for people.
Key Questions
How many horses and mules worked on U.S. farms at the peak?
The source cites a combined peak of 26.7 million on January 1, 1918: 21.2 million horses and 5.5 million mules.
How many remained by 1960?
The source gives a combined count of 3.1 million farm horses and mules in 1960, almost 90% below the 1918 peak.
How much land grew feed for the animals?
An estimated 93 million acres in 1915 grew feed for horses and mules, according to the historical figures cited by the episode. The source says the figure was about 5 million acres by 1960.
Did tractors alone cause farm employment to fall?
The figures show that tractors spread as farm employment declined, but the source also describes combines, other machinery, fertilizer and improved seed. It does not separate the contribution of each factor.
Does the horse-to-tractor shift predict what automation will do to human workers?
No. The episode presents the comparison as an analogy, not a law or forecast. Human workers can move between jobs and have rights and political influence that animals did not have.
Source: ThorstenMeyerAI.com
