Most of us are no Fan of FDR’s first two terms, but he did the right thing by rearming in 1940-41. Lend-Lease and the Selective Service were good bipartisan ideas. Contrary to the America First line, there was no plan to declare war on Nazi Germany prior to Pearl Harbor.
FDR’s “Arsenal of Democracy” speech was for all intents and purposes a Declaration of War on Germany. Anyone who heard it, knew war was coming one way or the other.
And remember, it wasn’t just Germany. It was Japan controlling Asia, Italy controlling Africa and Germany, all of Europe. This is what we were staring at. Eventually the Axis would have moved into South America and threaten the US, if we had not ultimately acted.