Deere & Company dominates North American farm equipment, its green and yellow machines an emblem of agriculture itself. Combines and tractors are increasingly rolling computers: precision guidance, automated spraying that distinguishes crops from weeds, and software subscriptions that tie farmers into the ecosystem. Construction and forestry equipment adds a second cyclical business. Farm incomes and crop prices set the demand cycle. John Deere founded the company in 1837 around a self-scouring steel plow that conquered prairie soil.