Prior to the mid-nineteenth century, farm work in America was often done by hand with little technological advancement. After this time, inventions such as the mechanical reaper, steel plow and cotton

Prior to the mid-nineteenth century, farm work in America was often done by hand with little technological advancement. After this time, inventions such as the mechanical reaper, steel plow and cotton gin resulted in the - a. decreased use of slave labor. b. need for labor unions. c. need for agricultural schools. d. increased efficiency of production.

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