Why has the U.S. spent over $1 trillion annually yet won no war since 1945?

I don't want to hear all the whining about Kuwait and Libya and Panama and all that crap. Those were firefights and skirmishes, not wars. The only other war that I didn't mention is Korea, and Korea was a draw. The reason it was a draw is that the North Korean infantry kicked the shit out of the United States Marines (read about the Chosin Reservoir), and the United States sued for peace.

Why has the U.S. spent over $1 trillion annually yet won no war since 1945?
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