Ever hear of Pearl Harbor? Japanese bombed pearl harbor. Since Japan and Germany were allied we automatically were at war with Germany too.
Maybe true, though they did lend the UK many £££ (or is that $$$) and UK purchased these warfare vehicles and fighting men from us, UK only recently paid off the debt to the USA a few years ago, think it was 2006.
Seems like the USA likes to keep the wars going as its very profitable, but that's only my opinion.