If America just focused on herself for a while, we'd be in a much better position. Like keeping useful defense projects like the F22 Raptor and scrapping foreign projects- like wars and stuff.

War time industry does stimulate the economy but... not the way it currently is.

Lets look at England, 50 years ago:
-'Ello old chap!
-'Ello!
-So how bout our Empire? Biggest in the world now...
-Indeed! But it costs so much to maintain and everyone is revolting and rioting.
-Ah! Let us simply retreat to our borders, let them deal with their issues, and play sports that no one else understands or can afford and invent absurd and unnecessary meals to distinguish ourselves as aloof.
-Huzzah! And we shall call said sports Crew, Cricket, Croquet, Polo and Golf; said meals shall be called Tea, Elevenses, High Tea and so forth.
-Good show old chap!
-Rather!

50 years later, England is sitting pretty with the most powerful currency in the world, and has few greater concerns other than missing tea time or who won the Henley.

The US can be the next England. Yes we can!