The germans lost so many soldiers, and equipment/armory that they couldn't attack the allies again. It destroyed the German army, and lead to the end of the war.
The French Revolution was the first democratic revolution in Europe that actually gave birth to a stable democratic state. Foremost it is seen as the beginning of the democratization of Europe.
Before the bombing of Pearl Harbor by the Japanese, most Americans were hesitant to engage in another European war (the first one being WWI). American sentiment began to change, however, after the Germans began sinking American ships.
In 2015 it was estimated 46,282,080 backs in the us