President Theodore Roosevelt applied Alfred Thayer Mahan's philosophy in order to justify:
A. military intervention to control sea lanes in the Atlantic and the
Pacific
B. immigration quotas to secure jobs for American workers.
c. policing the Western Hemisphere to protect American interests.
D. the acquisition of Pacific territories to expand American markets.

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.

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.