Lend-Lease Program
Germany had to fight britain alone
Germany
Germany, Japan, and Italy.
Germany was conquering all of Europe. It wanted to take down Britain because basically, Britain was just standing in their way of World Dominance.
Help Britain fight Germany
Britain was the enemy of the volunteers, so naturally they were not going to fight with their enemy, so they stayed out of it.
Germany, France, Britain, Russia
Germany
The US did not have any standing agreements to aid Poland in the event of an invasion, France and Great Britain did. There was no need for the US to pick a fight with Germany just for the sake of fighting.
According to some, appeasement was reasonable because Great Britain and France were in no shape to fight another war with Germany. The only other option was appeasement, which allowed Germany to take control of the Sudetenland. Some say that it encouraged Germany to demand even more, but to most officials in France and Great Britain, appeasement was the most reasonable solution.
Lend-Lease
The Triple Entente (Britain, France and Germany)