Leadership of US in the world is sadly the fact.
1. Great military power, including leadership in NATO (does anybody know targets of NATO after Eastern military block had gone?)
2. Financial center of the world, many countries keep their reserves in US treasuries, also many counties deposited their gold reserves in US (should be forever like Germany).
3. Political authority in the West world (all know about what Warsaw does for Washington, and who was the British poodle of ex-president of US).
4. Real military danger for any country in the world that don't agree to be leaded by US (including Ukraine).
The worst thing that such "leader" uses the power to organize destabilisation in other countries, that brings murder of mass of peaceful people there.
I've heard that Obama make some moves in the foreign policy because some part of US elite has begun to lose faith that US is yet the most powerful country in the world.
I also know many countries where people well know that their country isn't the world leader (and probably not in top ten) and this is not a reason for them to rebel against the legal power.
KGB, are you sure that US people are ready to rebel with such a reason? Should be unbelievable though.