I believe the answer you're looking for is slavery, but there were other factors that caused the civil war.
Many borders changed; for instance, the German border was reestablished, and then divided into East Germany and West Germany.
The number of common people involved in gotv
The Anderson National Historic Site Located at Andersville, Georgia.
Hiram Rhodes Revels
During Reconstruction, only the state legislature of Mississippi elected any black senators. On February 25, 1870, Hiram Rhodes Revels was seated as the first black member of the Senate, while Blanche Bruce, also of Mississippi, seated in 1875, was the second. Revels was the first black member of the Congress overall