Perun said:
That thought has three flaws: The first is the idea that the ex-powers gave up their power willingly, which they didn't. They lost them in two world wars and, in the case of Britain and France, in colonial struggles afterwards. But that is not my point - good riddance to them all, Britain, France, Germany and Japan were terrible at their job.
No disagreement here, but by the end of the war, there was a need for the West contain the Soviets, the US was the one country in a position to do that and had through the course of the war evolved into that position. The US made a mistake of insulating itself after WWI and was not going to make that mistake again.
Perun said:
The second flaw is the idea that the world needs leading powers to dominate the globe. Why should the US or any other country alone take the responsibility of maintaining peace and security? That is a flawed system, because that power will always go after those cases that benefit them the most first. That is even a legit survival strategy, but that is why this system can't work. This may be a shock to many, but the world isn't waiting for the US to save them. In fact, many people in the world are waiting for someone to save them from the US. That is what Osama promised.
I agree with this to a point, there are more world struggles that the US is not involved militarily in than there are wars that we are involved in. Looking at the recent conflicts the US was involved, I think there is a clear reason we went into Afghanistan and there seemed to be a general agreement that we should amongst other nations. Iraq is a bit different, but there was at least some international support for that as well and there had been oodles of UN resolutions against Iraq that did nothing. The execution of both these wars is a different story, but at the start of both there was support.
The third flaw is the idea that Europe is weak and dependent on the US for defence. That may have been the truth in the post-war decades, but things have changed. Europe could defend itself if need be, but Europeans prefer to find peaceful alternatives before they get out their guns. I've always felt that is something Americans can't understand, because their country was not bombed to kingdom come in the forties. If you've had a bombed-out country once, you do everything to prevent that from happening again, and you also emphasise with others who don't want that to happen to them.
Since the late 1990s what you say here is true, the US military is less focused on Europe as a place to defend, at this point the bases there are used to support operations elsewhere. Europe can defend itself, there is no real threat that Europe is facing.
So why do the Europeans remain allied with the Americans? Because peace is better than war, no matter what the outcome. Nobody wants to take the role of the world's policeman from the Americans, because that would mean war, and nobody wants a war. War is a bad thing to Europeans.
Europe does not need to take the role of policeman from the US, but there are cases in the world where force is needed, many of those places are areas where Europe has interests and should be willing to keep the peace (Rawanda comes to mind). The complaints against the US seem to be we do too much (Iraq) or If you are in Iraq, why are you not stopping what is happening in Darfur (for example).
Certainly within the US there has been debate over Iraq mainly and internally I think it is unlikely something like that will happen for some time just from US sentiment.
I'll add too, if the US were to announce tomorrow that within a year we are pulling all troops back to the US and are no longer the world's policeman, there would be at a minimum regional power vacumns. Something would move to fill them, perhaps they would do a better job than the US, perhaps not.