Why did Hitler declare war on the U.S.?

after 12/7/41, the isolationists could have said, “OK, we’re at war with Japan, but we can still stay out of Europe.” Hitler made it easier for FDR to commit totally. Why?

Moderating:

This discussion is not framed as a debate, or with any framework at all, really. We expect posters to give some citations and assertions to support their initial discussion.

Accordingly, this is closed. Feel free to try again with some meat on the bones.