What war would you say was worth the United States participating in?

I Say The American Revolution And World War 2..... The Reason Why The American Revolution Is So IMPORTANT Is Cause If That Event(War) Didn't Occur Americans Wouldn't Be Their Own Country But Instead Be Appart Of Canada(British?). World War Two Is The Second Most Important Because They Not Only Fought Because Of The Jewish Population But To Also Save All Of Their Allied Country(France,Belgium,etc...) It Was Pretty Important To Me???? Its My Opinion Though..