How did the American entry into world war 1 and the Russian withdrawal from world war 1 affect the allied war effort and the war's outcome?

Without Russia the Allies were very weak but then the U.S came in with a very strong navy witch helped the Allies a lot. The Western Allies were concerned by the Bolshvik Revolution. US Forces occupied Vladivostok in 1917-18, and British forces occupied Archangel.