Indeed. It was exactly the other way around, as many nationalists (including the KKK) did not want to get into the war and held a lot of sway right up until Pearl Harbor.
After Pearl Harbor, there was no keeping USA out of the war.
Hitler was working hard on PR to keep the US out. Recent I saw a map the Nazis had made with the proportion of the population of German descent for each US state, created for propaganda purposes.
After Pearl Harbor, there was no keeping USA out of the war.