> Honestly, I don't think we had much business in WWI or the European Theatre
> of WWII, either.  Focusing our efforts in WWII on the Japanese, who had
bombed
> us, would have made more sense and probably cost us a lot less.

I agree with most of your post, but I have to point out that Hitler
declared war on the US on Dec 11, 1941.  Hitler was also sinking US ships
that were carrying supplies to Britain.

Note that Roosevelt minor had the US Navy involved in World War II long 
before the Japanese attacked Pearl Harbor.  The "Greer Incident," where
the US destroyer Greer was fired on by a U-Boat, occurred because the
Greer had detected the U-Boat and radioed for British aircraft (from
Canada) to come and bomb it.  The U-Boat captain had no idea who'd
dropped the bomb/depth charges and the only ship around was the Greer. 
This sort of thing was quite common in 1940-1941
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