What if the U.S. had not entered the war?

Simple. If the U.S. had not entered the war then WWI would have dragged on for a couple more years until finally either Britian or Germany was starved out and could no longer support itself for war. The destruction would have even more terrible and the casualties still more astronomical. It is possible that the influenza pandemic would have caused even more trouble with the soldiers had they still been fighting trench warfare in 1919. I also feel that if the U.S. never entered the war that Germany would have succeeded in taking Paris (since the Brits and French had grown so weak) and woulod therefore have won the war. As it was the German Army was only 37 miles to Paris at the moment the Americans joined the War. With a German victory the Versailles Treaty would have been completely in their favor and they would gain numerous territory across the globe as well as demand extremely unreasonable indemnities of the Allies (exactly the opposite of what the Allies did to Germany in the actual Versailles Treaty) All-in-all, without American support the Brits and the French would have fallen to the German/Central Alliance and suffered the exact way the Germans did when they didn't win.