In the mid-1910s, the 4-cyclinder Titan appeared, and by the end of the decade, International Harvester came out with the Junior, whose engine was enclosed under a bonnet in a style that defined tractor design for decades to come. Both competed with another International Harvester tractor, the blue-bodied, red-wheeled McCormick-Deering 15-30, which was used by wheat farmers throughout the 1920s and into the 1930s.

One of the most famous International Harvesters was the Farmall, introduced in 1920. This all-around tractor had a wide rear axle so that the wheels could ride between rows during cultivating. The first Farmall was called the Regular, followed by models F-20 and F-30, some of which were configured with a wide axle in the front and high clearances. Other pre-war Farmalls included the Model A Cultivision (designed to cultivate a single row), the 8hp Cub, and the Raymond Loewy-designed Farmall H, all of which were painted a deep, classic red.

The first Case tractors had enormous engines (30 to 60hp), although tractors with smaller engines quickly followed. These three-wheel, "cross-motor" tractors had 4-cylinder engines, but the breakthrough for the company came in 1929 with the release of the Case L and its smaller cousin, the C, whose in-line engine became an industry standard. In the 1930s, Case introduced the D series (painted in Flambeau red and black) and the R series, whose grilles had an Art Deco sunburst design. The unprofitable V made the 1940s a shaky decade for the company, but Case got back on track in the 1950s with the Case 300 and 400, which set a record in 1956 for fuel economy.

In contrast, the first Allis-Chalmers tractors started out small (6 to 12hp). Low, orchard versions of these tractors were produced, as was a model with spiked wheels. By 1922, its model 20-35 was being touted as "The Greatest Tractor Ever Built." Canopies were among the tractor’s numerous optional features. Crawler tractors with tank treads were added in 1928, and in the 1930s, Allis-Chalmers switched over to rubber wheels. The workhorse Model B was introduced in 1937, while the WD-45 and the CA got the company through the 1950s.

John Deere’s first years in the tractor business were spent manufacturing bright-green Waterloo Boy tractors, which was the name of the Froelich tractor company it had purchased in 1918. Deere’s first non-Froelich tractor was the model D, whose 2-cylinder horizontal engine remained in production for more than 30 years. The GP followed in 1929, although reviews were not good (it was underpowered, among other problems), the Henry Dreyfuss designed A appeared in 1934, and the first Deere diesel, the 2-cylinder model R, arrived in 1949. Among other landmarks, it was the first John Deere tractor to feature the company’s now famous "leaping deer" logo.

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