By the end of the civil war: a. many confederate leaders had been tried for treason. b. african americans had gained full citizenship. c. the south’s economy had been destroyed. d. congress had passed legislation to rebuild the nation.

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.