Write down five major inventions that improved agricultural output between 1750 and 1870.

1790sCradle and scythe introduced; invention of cotton gin (1793); Thomas Jefferson's plow with moldboard of least resistance tested (1794)

1793Eli Whitney invents the cotton gin, which contributes to the success of cotton as a Southern cash crop

1797Charles Newbold patents first cast-iron plow

1800

1801Thomas Moore of Maryland invents the icebox refrigerator

1819Jethro Wood patents iron plow with interchangeable parts