What contributions did Cyrus McCormick and John Deery make to farming?

Cyrus McCormick is best known for inventing the mechanical reaper in 1831, which revolutionized the harvesting of crops by significantly increasing efficiency and reducing the labor required for harvesting grain. JOHN DEERe, on the other hand, made significant contributions by developing the first successful steel plow in 1837, which allowed farmers to more effectively till tough prairie soil. Together, their innovations greatly advanced agricultural productivity and transformed farming practices in the 19th century.