If this country (United States) is so badly broke, why dont they just print more money?

I just dont get it. Why doesnt the government just print more money to fix our economy and stop spending stupidly. Can someone help me understand? Thanks
Update: Then why are other countries doing better then us economically?
Update 2: Then why are other countries doing better then us economically?
Update 3: Are you saying that other countries have less money therefore the money is stronger? Like the euro?
Update 4: joe s, thank you for your answer
24 answers 24