How many countries have attacked the USA since 1941?

I was curious, since the USA has declared war on or bombed over 20 countries since then. If the USA is, as Bush says " a peaceful nation", that seems to be an awful lot of bombing when you haven't been attacked by any country
Update: skitter; just out of curiosity, how many guns & bibles are there in your house?
Update 2: devildriver; presumably you keep your white pointy hat in your pickup?
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