http://www.apple.com/trailers/sony/whywefight/trailer/
750 Billions $ a year for keeping wars alive no matter what.
It's not about oil, because pretty much all the oil of the middle east is flowing in the US, traded for weapons and cool nuclear stuff.
It's not about the fact that Africa is the richest continent ever (90% of worldwide oil, diamond, gold, silver,... comes from there) and still consider the poorest because it's stollen since the last century.
It's just that building/selling cool weapons makes America richer.
It's just a business and that's the American way.
It all start in 1492, they discover a continent full of wealth and gold, went there, kill, rape and steal every cat there, and name it "America".
Amercia was born on that principle.
Why would it change.
It doesnt matter who's in war with who as long as there are wars.