The portugese gained control of the eastern part of south america through a) the treaty of tordesillas b) the columbian exchange c) the demarcation act d) the french alliance

A. the Treaty of Tordesillas

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.

19th amendment granted women the right to vote. the 19th amendment guarantees all american women the right to vote.