I have to add my $0.02 here, just because I love history and I'm an American, unable to sit back and watch things without getting involved (it's a patriotic thing, I guess).
First off, it is the American public who does not like, as the '92 election coined it, being the "policemen of the world." We hate meddling in worldwide conflicts and problems as much as the world hates watching us do it. We do not like to see our servicemen go off into distant lands, and we do not like the constant travel warnings put out by the State Department due to those military actions. As a whole, we do not like military action unless we see our interests being threatened. But, the politicians see differently, and sometimes, correctly. Sometimes, things like the Bosnia and Kosovo conflicts may not directly affect us as a country, but politically and ethically, we cannot stand by when we have the means (when used properly) to help (for some reason, those ethical standards have yet to extend to African conflicts). This situation presents itself time and time again. The Vietnam War, the Korean Conflict, WWI and WWII, etc. are examples of times where some kind of flare up in the world that affected us (either real, like the WWs, or imagined, like Vietnam). It used to be that the USA was a isolationist country, not likely to intervine in anything outside of its borders. WWI changed that, slowly, as we realized that a war in Europe can has negative effects on the USA. The public continued to oppose it, as they just saw their husbands, fathers, and sons coming back in body bags from some foreign land, dying for a cause that they didn't understand. WWII would never have seen the USA if not for the bombing of Pearl Harbor. Before that, the public strongly opposed anything more than humanitarian aid to the Allied countries, as it made the people feel good about helping the war effort. After Pearl Harbor though, people went balistic, calling for a decimation of the Japanese (hence the internment camps of Asians, but nothing for Germans or Italians). The politicians happily complied, as they knew that things in Europe were going very bad for Britin (the only remaining Allied "power" left). Having the resources to fight a two front-war was no problem for the USA, as we had the manpower, industrial power, and the public's zeal to destroy the tyrants of the world. So, while the British valiently held off the Germans, soon enough, the British would have been beaten, but not without heavy losses for the Germans. With America's public entrence into the war (there were squadrons of American pilots whoring themselves to the British), that inevitably turned the tide of WWII both in the Atlantic and Pacific.
After the USSR gobbled up huge chunks of land after the war, America, in between rebuilding Europe and Asia, came down with Red Fever, causing them to see commies in every nook and cranny. The politicians became paranoid and soon drafted a policy for world politics. It basically stated that the US would become the democratic champion in the world, bravely crusading against communisum (aka the Russians) That is the explination of both Korea and Vietnam, as well as the formation of NATO. Now, after the Gulf War, Americans are again tired of policing the world, and are sick of hearing about bombing Iraqi targets, NATO peacekeepers, and other worldwide conflicts. Those of you who detest American involvement in the world will be happy to know that the current crop of politicians are become isolationists, willing to let the world, as they see it, desrtoy itself, since the world seems to hate America (their basic reasoning, not mine).
Now, economically, it is accepted in America that soon China will become the economic leader in the world, due solely to it's size and population. We accept that as a country, but still, there is Red Fever in the politics, and that makes the USA act irrationally sometimes in policies towards Taiwan/China. Also, while the American economy may be slowing, that means nothing, as unemployment is still around %4.5-5, our GDP is still growing, and inflation is still low.
Militarilly, we still have the power to wipe out small countries. It is US military policy to be prepared to fight two regional wars at the same time, and since most action the US takes now are joint efforts either with NATO or the UN, that leaves plenty of forces in reserve.
In closing, America, hated be some (mainly China, France, and Russia, if one looks at the UN Security Council), loved by a few (at least in terms of closeness), and tolerated by most, is still a country to be rekoned with, as we still have enough military, economic, and political (aka bullying) power to dictate some world issues. The EU, while a good plan, may still yet dissolve, as the differences in regional policies make for an unstable coalition at best. China will be a world power, but in terms of overall power, will not best America, yet. And the rest of the world is still recovering from a post-Cold War era, as no longer are S. America and Africa important places for superpowers' interests. They are still important areas, but either do not have the stablity or the power to leverage any kind of world wide schemes.
-SammyBoy
Without Evil, there can be no Good. Therefore, without an Intel, there can be no AMD.