@Ionus,
Lord there is zero question that the descents of the black slaves brought to what is now the US are on the whole one hell of a lot better off then those who ancestors remain in Africa.
In fact, given that the men and women ship over were highly likely to had already been slaves, being ship over to the colonies even given the death rate on slave ships was not the worst fate they could had faced.
White men did not leave their ships to chase happy black folks around the jungle but instead purchased them from either black tribal leaders or the good old humane Arab slave traders.