What were the cause and effect of nativism, fear of Communism, anarchists, immigration, and quota system after the world war how did it affect people.

Militarism is the answer.

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.