For thousands of years, agriculture depended on muscle.
First came human labor. Then oxen. Then horses.
Plows improved. Harnesses became more efficient. Farming techniques advanced. Yet the source of power remained essentially unchanged. Every field was planted, cultivated, and harvested by living animals that required constant care and enormous amounts of feed.
By 1920, more than 25 million horses and mules worked on American farms. They pulled plows through spring soil, hauled wagons, cultivated corn, operated harvest equipment, and transported crops to market. They were indispensable.
But they were also expensive.
In 1915, approximately 93 million acres of American farmland—nearly 27 percent of all harvested cropland—were devoted solely to growing feed for horses and mules. More than one-quarter of the nation’s agricultural land was being used to fuel the very animals that powered farming itself.
The situation created a fundamental limitation on agricultural productivity. Farmers could only grow as much food as their animals allowed.
The machine that would change this reality began as a pencil sketch in a Chicago engineering office.
Its creator was an Iowa farm boy named Bert R. Benjamin.
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An Engineer Raised on the Farm
Bert Rufus Benjamin was born in 1870 near Newton, Iowa, the son of Jonathan E. Benjamin and Louise Maria Boydston Benjamin.
Like countless children raised on Midwestern farms, he began working young.
By the age of eight, he was already helping with daily farm operations. By twelve, he could adjust plows, repair harrows, sharpen mower blades, and diagnose problems with farm machinery. Neighbors quickly learned that if a piece of equipment broke, young Bert could usually fix it.
His mechanical talent was obvious.
After attending local schools and the Hazeldell Academy, where he earned near-perfect grades, Benjamin enrolled at Iowa State College in Ames. He studied mechanical engineering while teaching in rural schools to help finance his education.
He graduated in 1893 with a Bachelor of Science degree in Mechanical Engineering.
Shortly afterward, he joined the McCormick Harvesting Machine Company in Chicago as a draftsman in the experimental department.
It would be the beginning of a career that lasted nearly half a century.
The Rise of International Harvester
Benjamin’s career advanced steadily.
By 1901 he had become chief inspector at McCormick. Then, in 1902, industrial history took a dramatic turn.
McCormick merged with Deering Harvester and three other manufacturers under the financial backing of banker J.P. Morgan. The new corporation became International Harvester Company.
The merger created an agricultural giant.
International Harvester controlled approximately 90 percent of the grain binder market and 80 percent of mower production in the United States. Few manufacturing companies possessed comparable influence over a single industry.
Benjamin remained with the organization, serving as chief inspector and later superintendent of the experimental department.
During these years he watched tractors begin appearing on American farms.
What he saw was disappointing.
The Problem with Early Tractors
The tractor was not a new invention.
By the early twentieth century, machines like the Fordson tractor had already begun transforming certain farming tasks. Introduced by Henry Ford in 1917, the Fordson became an instant success.
Farmers loved its affordability.
At first priced at $750 and later reduced to only $395 during an intense price war, the Fordson rapidly dominated the market. By 1923 it accounted for approximately 77 percent of all tractor sales in the United States.
But it had a major weakness.
The Fordson could plow.
It could operate belt-driven equipment.
It could perform heavy field work.
What it could not do was cultivate growing crops.
Once corn emerged from the ground, farmers still relied on horses to move carefully between rows without destroying plants. As a result, most farms continued maintaining large horse populations despite owning tractors.
Agricultural historian Bruce L. Gardner later estimated that one tractor could perform the work of five horses.
The problem was that tractors of the 1920s could not actually replace all five horses.
They could replace some of them.
Benjamin wanted a machine that could replace them all.
The Birth of the Farmall
In 1917, Benjamin developed a revolutionary idea.
Rather than building a tractor solely for heavy work, he envisioned a machine capable of performing every major farm task.
The concept seemed simple.
The tractor would have adjustable rear wheels wide enough to straddle crop rows.
Its front end would be narrow enough to fit between plants.
It would possess enough clearance to avoid damaging crops during cultivation.
Years later Benjamin summarized the philosophy in a single sentence:
“A tractor that does not replace the horse is only half the answer to the farm tractor problem.”
This became the foundation of what would later be called the “row-crop tractor.”
The idea faced skepticism inside International Harvester.
Many executives considered it impractical.
Many bankers believed farmers would never embrace such a specialized machine.
Yet Benjamin persisted.
By 1921, he completed the sketches that became the Farmall.
Testing a Radical Machine
The first Farmall prototypes looked unlike anything farmers had seen before.
They featured a distinctive tricycle design with narrow front wheels and large rear wheels. Their high ground clearance allowed them to pass over growing crops. Adjustable wheel spacing enabled adaptation to different planting systems.
Farmers thought they looked strange.
Some laughed.
Others doubted the machines could remain stable.
International Harvester nevertheless proceeded with testing.
Twenty-six early Farmalls were built. Half remained in company testing programs while the others were distributed across the country for demonstrations.
The most enthusiastic response came from Texas.
Farmers there quickly recognized the machine’s potential.
Several test tractors accumulated more than 15,000 operating hours with minimal problems. Texas growers became so convinced of the Farmall’s value that they reportedly threatened to build their own versions if International Harvester refused to increase production.
The message was clear.
Farmers wanted the machine.
Production Begins
In February 1924, International Harvester shipped the first production Farmalls.
Only 205 units were built that year.
Each cost $825.
Powered by a four-cylinder gasoline engine producing approximately 18 horsepower at the belt and more than 12 horsepower at the drawbar, the Farmall was not especially powerful.
Its genius lay elsewhere.
Every element of the design served a single purpose.
The narrow front wheels allowed precise navigation between rows.
The elevated rear axle cleared crops.
The adjustable wheel spacing accommodated different field layouts.
Integrated mounting points enabled cultivators, planters, and mowers to attach directly to the tractor.
For the first time, one machine could perform virtually every major farming operation.
The horse finally had a true competitor.
Conquering the Depression
The Farmall’s success accelerated rapidly.
International Harvester opened a dedicated manufacturing facility in Rock Island, Illinois, in 1926.
Production expanded from 25 tractors per day to 200 per day within a few years.
Annual sales climbed from thousands to tens of thousands.
Then disaster struck.
In October 1929, the stock market crashed.
The Great Depression devastated American agriculture. Crop prices collapsed. Foreclosures spread throughout the Midwest. Farm incomes evaporated.
Many believed tractor sales would disappear entirely.
Instead, the Farmall continued growing.
Farmers increasingly viewed mechanization as a necessity rather than a luxury. A tractor could perform work previously requiring multiple horses and hired laborers.
During the worst economic crisis in modern history, the Farmall became even more important.
By 1932, more than 134,000 Farmalls had been produced.
The Machine That Became the Industry Standard
Benjamin never stopped improving his invention.
Throughout his career he accumulated more than 140 patents covering nearly every aspect of agricultural machinery.
His innovations included cultivator systems, drawbars, harvesting equipment, cotton pickers, and countless mechanical improvements.
By the late 1930s, International Harvester introduced the famous letter series tractors:
- Farmall A
- Farmall B
- Farmall H
- Farmall M
The Farmall H alone eventually sold more than 390,000 units.
Competitors scrambled to imitate the design.
John Deere introduced its GP tricycle tractor.
Oliver, Allis-Chalmers, and Minneapolis-Moline followed with similar concepts.
By the mid-1930s, nearly every major tractor manufacturer had adopted the basic Farmall formula.
The Farmall was no longer merely a product.
It had become a category.
Replacing the Horse
The true impact of the Farmall can be measured in numbers.
In 1920, America employed more than 25 million horses and mules in agriculture.
By 1945, tractor power surpassed animal power for the first time in history.
By 1960, the horse and mule population had fallen to roughly 2.5 million.
The consequences were enormous.
The 93 million acres once used to grow feed for work animals declined to approximately 4 million acres.
Nearly 89 million acres of farmland became available for growing food for people rather than fuel for animals.
This shift dramatically increased agricultural productivity.
Soybean production exploded.
Corn yields expanded.
American agriculture entered a new era of efficiency.
The Farmall had accomplished what Benjamin envisioned decades earlier.
It had completely replaced the horse.
A Million Tractors and Beyond
In 1947, International Harvester celebrated production of its one-millionth tractor.
The machine was a Farmall M.
The milestone represented more than manufacturing success.
It marked the moment when the row-crop tractor became the standard machine of modern agriculture.
The company continued introducing innovations.
In 1941 it launched the world’s first diesel row-crop tractor, the Farmall MD.
In 1947 it released the compact Farmall Cub.
In 1954 it unveiled the modernized 100 Series.
Production milestones followed one after another.
Three million tractors by 1955.
Four million by 1964.
Five million Farmalls by 1974.
At its peak, the Rock Island Farmall Works employed approximately 5,000 workers and produced up to 350 tractors every day.
The End of an Era
Bert Benjamin retired in 1940 after 47 years with McCormick and International Harvester.
He was seventy years old.
By then, the Farmall design influenced roughly 90 percent of all tractors sold in America.
He lived long enough to witness the transformation he had helped create.
In 1968, Iowa State University honored him with its Professional Achievement Citation in Engineering.
He died in 1969 at the age of 98.
He was buried near Newton, Iowa, only a few miles from the farm where he had first learned to repair machinery as a boy.
The Farmall continued long after his death.
But the agricultural industry was changing.
International Harvester struggled during the economic turmoil of the 1970s and early 1980s. A devastating strike, declining profits, and the farm crisis weakened the company.
In 1984, International Harvester sold its agricultural division to Tenneco, owner of J.I. Case.
The final Farmall tractor rolled off the Rock Island assembly line on May 14, 1985.
Workers gathered to witness history.
Among them stood Herbert Hall Sr., who had helped build the first Farmall in 1926, and his son Herbert Hall Jr., who drove the last one off the line nearly sixty years later.
The factory closed permanently the following year.
A Legacy That Changed Agriculture Forever
Today, the Farmall name survives under Case IH, part of CNH Industrial. New Farmall tractors continue to be manufactured and sold around the world.
Yet the machine’s greatest achievement occurred decades ago.
Bert Benjamin did not invent the tractor.
He did not invent the internal combustion engine.
He did not invent the power take-off.
What he did was recognize a flaw that others ignored.
A tractor that still required horses was not a complete solution.
So he designed one that was.
The result transformed agriculture more profoundly than perhaps any machine before it.
For thousands of years, farming depended on animal power.
By the mid-twentieth century, that era was over.
One tractor design, drawn in pencil by an Iowa farm boy in 1921 and put into production in 1924, helped make it happen.
Bert R. Benjamin mechanized American agriculture one row at a time.
