Some people criticized the use of atomic weapons by the united states in
japan as:

a demonstration of power designed to impress the soviet union

explanation:

the tallest building in the western hemisphere and the sixth tallest building in the world

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.