One of the major inventions that improved agricultural output between 1750 and 1870 are: - Cotton gin : Eli Whitney invents the cotton gin in 1793, which contributes to the success of cotton as a Southern cash crop. - iron plow : Jethro Wood invented the iron plow with interchangeable parts in 1819 - Factory-made agricultural machinery (1840s)- this encouraged commercial farming - chemical fertilizers were sold commercially (1849) - Steam tractors are tried out
