I’m not sure when you say U.S. but the Republicans supported the idea of state rights. (If you could clarify you question I could help more).
Answer:
Kush began to fade as a power by the 1st or 2nd century AD, sapped by the war with the Roman province of Egypt and the decline of its traditional industries. ... Christianity began to gain over the old pharaonic religion and by the mid-sixth century AD the Kingdom of Kush was dissolved.
(credits to the rightful owner of these answers, I just hope this helps you :)
The settlers believed they were better than the natives and could do whatever they wanted to them they felt entitled to the land and resources and had no problems taking it so basically the settlers thought they could do whatever they wanted and the Indians didn’t take kindly to it
William T Sherman in his march to the sea destroyed railroads to debilitate the confederates supply chains, as well as break the will to fight of the confederates :DDDDD
