We didn't only join when the allies started to win... What happened was that in that time the american society had an Isolationist view. Which was basically "They did no wrong to us we do no wrong to them." In all honesty America wanted to stay out of the war until it was over if at all possible. Mind you the entire time we were providing support and aid to the Allied countries. But the only reason we didn't stay neutral was the Atrocity that occurred at Pearl Harbor.

We didn't only join when the allies started to win... What happened was that in that time the american society had an Isolationist view. Which was basically "They did no wrong to us we do no wrong to them." In all honesty America wanted to stay out of the war until it was over if at all possible. Mind you the entire time we were providing support and aid to the Allied countries. But the only reason we didn't stay neutral was the Atrocity that occurred at Pearl Harbor.

The help provided by America was tremendous and can be pointed out in 3 major actions. First off the "Destroyers for Bases Deal", which gave Britain much needed Destroyer ships at that time. Being in constant threat of German invasion by sea Britain was in great need of any ships possible. Another problem from the time, was that Britain cargo ships were being sunk by German U-Boats. But when the United States set up the Hemisphere Defense Zone. It allowed them to still remain neutral while being able to pinpoint the German U-Boats and alerting British cargo ships. Finally the "Lend Lease Act" which was vital to the Allied war efforts. It gave not only Britain but all the allied countries much needed war supplies with only asking for them to be returned. These 3 actions helped to turn the tide of war during that time, and even later when America joined the War on the side of the allies, and took the Empire of Japan head-on, thus eliminating the need to fight an entire Empire allowing the rest of the Allied forces to focus on Germany and the Nazi's