The issue of counting slaves in the population which determined representation in Congress was a major issue at the heart of the 3/5 Compromise which was one of the major compromises between the northern and southern states during the Constitutional Convention of 1787.
During world war II, at least in America, it was African Americans who experience changes most like the changes experienced by women, because there was far more demand for them in the labor force.
True. The fact that they were in groups makes them a civilization. However, the criteria for civilization is fluid and I would need more information from the lesson to give a definitive answer.