I believe the answer is: they had been born in the United States and considered it home
Despite the horrible treatment that they received, they still see United States to be the environment that they are the most familiar with. On top of that, a lot of them believe that the amount of job opportunities in united states far exceeded those in African continent.
The civil rights movement was an effort by Those of color (African Americans) to gain equal rights and end discrimination
The answer is D. It was against the constitution to do the purchase, but he thought it was a good idea and did it anyway.
(Sorry this is a late answer lad :( ) But the answer is D. It caused the tribes to lose their culture as they assimilated.
As the tribes were moved from their land, many of them died and the ones who didn't die ended up getting their religion and culture completely removed or assimilated
