How did Washington manage to not attack any other country besides Japan in 1941-1945?

It seems like the US was doing a lot of stuff prior to 1941. They were supplying supplies to the UK and the USSR, patrolling the Atlantic alongside the UK and had a naval presence in the Pacifc to deter Japan from attacking the Dutch East Indies. <br><br>Then, the war breaks out and they can only declare war on Japan. Somehow, they manage to fight a war in Europe and Africa, without attacking Germany/Italy. They even manage to send supplies to the USSR without attacking Germany and the UK without attacking Germany/Italy. How were they managing all of this? What was the scale of combat from 1941-1945 against Germany and Italy? The US seemed to have been in a weird limbo where they were clearly at war with everyone, but hadn't declared war yet.<br><br>&#x200B;