YANKEE / YANKEE BOY. Perhaps the most successful version of the American tractors was American Tractor Co. of Peoria. They started the production yr 1918, and produced a 15-30, which weighed 4,600 pounds and sold for $1,765. Its Erd engine was a 4-cylinder with a 4-by-6-inch bore and stroke. In 1920, the company changed its tractor name to Yankee.