A couple of quick remarks to elaborate on the last post:
1) It is not a task only for the United States to "calm the world". Its dominance and power is big, but not sufficient to control the amount of global war and chaos. And the cyber-sphere, where the USA is absolutely dominating, is of most use in the developed countries so heavily dependent on IT. Real wars and terrorism in or from the third world must be controlled through military and diplomatic and also economic means.
And to calm matters in this context we also need especially Russia, but China and the EU aswell. And most importantly, it is necessary for these players to cooperate.
Presently as said it is of paramount importance to stop the war in Syria and destroy ISIS here and in Iraq. Both to reduce suffering and terrorism and to end the massive streams of refugees. The last factor is contributing to the failure of the EU, through increasing disagreement and racist populism, and this can be in nobody's interest, unless of course a goal is a further weakening of the European competitor on the int'l scene.
The EU is a bit like the so-called Vertical Alliances (vertical meaning north-south) in the old Chinese modernity, the Warring States period around 500 - 221 BC. Like in other modernities including the present, the countries competed and fought for hegemony. As the state Qin in the west became more and more dominating, the other states tried to make unions, at certain times under a common prime minister, to balance and counter the power of Qin. But these unions were again and again split because of disagreements and particular interests. Some countries broke out and made so-called Horizontal Alliances (west-east) with Qin. And because of this incoherence of the Vertical Alliances Qin won in the end.
The EU can be seen as a vertical alliance trying to counter the big powers in east and west, this time in a more peaceful competetion. As the Chinese predecessors the attempt fails because of incoherence, disagreements and particular interests, even to the extent that countries like Spain, Belgium and the UK could break up.
The EU is unlikely ever to be a serious player on its own in the world. But its dissolution could be a globally destabilizing factor or at least mean the absence of a valuable stabilizing factor.
2) Concerning my comments on government, it is not implied that one-man or one-party rule is the only remedy against political decline. As often seen, not least in the English history of the Whigs and Tories 1700 - 1900, a two-party system can also be effective. But in the present atmosphere and phase a certain level of organization and control is necessary. Obviously power should alternate between the parties through elections, but populists and desperadoes should be excluded from real influence.
This could be an alternative to the Roman civil wars in the last century before Augustus. As said elsewhere it is unlikely for a dominating power in our civilization to disintegrate to the level of civil war. But also a lower level of chaos in such an important country would be highly undesirable. Like in Rome competing politicians could try to use the world as an arena for their fights. There could be more wars like the one by the younger Bush in Iraq.