Actually, the civil war make their relationship became much worse.
Because of the civil war, the ally has to lose a lot of resources for war supplies and equipment. This led to a situation where the allies no longer able to pay the treaties that they promisd to pay to the Sioux, which eventually ended up in conflict between the two group.
The correct answer is 2002! Hope this helps! ;D
In Southern states, political parties were defined as "private association" and excluded many times African Americans
