This depends slightly on the region of Africa in question, but many of them were re-sold into slavery for other tribes in the region, while others were eventually freed.
George Washington was the first president of the United States of America.
Voting patterns were determined by vague cultural inclinations
It helped our government because it created the 13 and the 14th amendments, it also inspired the 19th amendment to be passed, which is the amendment that gave women their rights.