A is the answer.
European population grew in settlements, while they killed the nearby Native Americans. Africans were taken as slaves and sent to America.
They probably felt inconvenienced by it, seeing as they already had to send their sons and husbands to war. This was just another thing they had to put up with that made life difficult
It weathers it down until it is nothing but sediment in a river, lake, or ocean.
Http://www.ucs.louisiana.edu/~ras2777/amgov/slavery2.html
