Guess you read different history books than the rest of us.
Guess I do. Perhaps you would give more credence to the opinion of an author whose numerous historical works won him the 1953 Nobel Prize in Literature, though he is actually far better known for his personal involvement in both world wars:
"America should have minded her own business and stayed out of the World War. If you hadn't entered the war the Allies would have made peace with Germany in the Spring of 1917. Had we made peace then there would have been no collapse in Russia followed by Communism, no breakdown in Italy followed by Fascism, and Germany would not have signed the Versailles Treaty, which has enthroned Nazism in Germany. If America had stayed out of the war, all these 'isms' wouldn't today be sweeping the continent of Europe and breaking down parliamentary government – and if England had made peace early in 1917, it would have saved over one million British, French, American, and other lives."~ Winston Churchill, Interview with William Griffen, Editor of New York Enquirer, August 1936