Where did the South surrender to the North at the conclusion of the Civil War?

In Appomattox Court House, Virginia,

Explanation:

Robert E. Lee surrenders. In Appomattox Court House, Virginia, Confederate General Robert E. Lee surrenders his 28,000 troops to Union General Ulysses S. Grant, effectively ending the American Civil War.

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.

missouri compromise of 1820 which prohibited slavery