In the 1920s, how did most national leaders hope to go about avoiding war?
a. by joining the world court
b. by winning the arms race
c. by avoiding close interaction with other nations
d. by forcing europe to disarm

A) by Joining the world court. 
 
Hope this helps :)

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.