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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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User RoteS
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11 votes

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sorry I don't know answer but I am new in this app

answered
User Stefan De Bruijn
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