How did the treaty of versailles and the league of nations disappoint president wilson?

They did not appoint the 14 points treaty. The French wanted vengeance for the enormous human cost of the war.

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.