Zeon, during the Clinton years, America WAS the UN. No one ever came begging to America to go into Bosnia, it was a US initiative. Same thing with a number of other military interventions. Only now that Dubya has taken over, do we see the UN disagreeing with America. This doesn't mean Clinton's policies were significantly different than Dubya's, its just that he knew how to manufacture consent among the "unruly masses" of the UN.
And, excuse my ignorance, but wasn't there also one or two other countries involved in WW2, other than America. I vaguely remeber the Russians sending a few troops, and Britain may or may not have dedicated a few planes to the cause. Probably just my memory playing tricks on me.