What preparation did the us take for World War 2?

Prior to WWII the US was still coming out of a depression and WWI was still pretty fresh in everyone's mind so most of the country and most of congress was in an isolationist mood and wanted nothing to do with anyone else's war. FDR, the president knew that sooner or later we were going to be involved with Germany and probably Japan but was having no luck at all convincing congress to prepare for war. So, he kind of back doored it. Britain was under constant and heavy attack from the Germans and did not have the industrial might to keep up with the Germans ship, airplane and weapons building. Roosevelt convinced the congress to support Britain with a lend/lease program for weapons. So our industrial might ramped up to provide support for Britain and because of that was already in full production mode when we entered the war.