African American
Support for the war effort

They helped the army with crops and food

Explanation:

And slavery ended after the war

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;

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.