What effects did the US entry into World War 2 have?

The consequences of America's entry into World War II were numerous. Most immediately, it boosted British and Soviet morale, as well as the hope of the many peoples and nations suffering occupation by the Axis. Quite soon, it led to a material advantage for the Allies as a whole, given the industrial output of the U.S. Eventually, it led to total defeat on the part of the Axis. Even more far-reaching, it led to the emergence of the U.S. as the world's foremost power.