In the United States, the Second Industrial Revolution lasted from the end of the American Revolution to 1800. the end of the American Revolution to 1850. the end of the Civil War to 1900, o the end of the Civil War to 1950.​

C

Explanation:

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.