It's hard to say as their war aims were'nt that easy to define.
America entered the war because of the Zimmerman telegram, so with that in mind you'd have to say 100% as they protected their borders and kept their Texan provinces.
They also emerged as the undoubted military and economic super power of the era with the correct political model for others to follow.
But, the Versailles treaty was a failure for them, Wilson did'nt understand individual European identity, enmity and cultures added to that good old fashioned imperialism (although America had'nt long concluded it's own imperial ambitions) because of this it retreated to it's policy of isolationism and eonomic expansion based on the reparations that ultimately brought about the global economic collapse and the moves towards extremism that heralded WW2.