We may be one planet, but we have divided ourselves with religion, and then divided ourselves further with B.S. like Baptism vs. Protestantism vs. Catholicism, or however the f**k it goes. Then we use those divisions to divide ourselves into countries and ethnic groups, then divide it even more into a class system where the rich rule over the poor. So in order to make a truly equal world, we would first have to make sure everyone has the same amount of wealth, education, etc. Then we would have to abolish individual country borders, which from what I can tell about human nature, is almost impossible, unless staring in the face of imminent extinction of the entire species, and even then you'll have people who want it to happen. Anyway, the final (and probably most difficult) thing to get rid of would be religion. This, of course, would probably be completely impossible unless humanity really DID go extinct. So while we have the responsibility to help others who need aid, not only do we rarely do that (and I mean the world as a whole, not just the United States). And the U.S. doesn't actually pick up responsibility, we just take it where we think that we can get something out of it, i.e. Iraq and Vietnam. Iraq, of course, was for oil. Does anybody here dispute that? And a large part of Vietnam was large supplies of rubber. Korea, maybe, was a genuine war fought in the name of freedom. I don't know. But ever since the 60s, natural resources have been a large, and the main, part of American wars.