Explain the causes and effects of the United States entering world war 2?

Cause:   Japanese attack on Pearl Harbor.

Effects: US joins British and fight against the Nazis

             US starts mass production of devices.

              They win the war

Explanation:

b. 155 enlisted men and no officers

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.