If you ask any stranger, and especially any beauty pageant contestant, what the single greatest thing they want to see, the answer invariably is world peace. They give this answer, not because they desire world peace, but because it is supposed that that is what others desire and want to hear. When we get right down to it, mankind individually desires power, wealth, and total dominion of the surrounding world. Peace is not the desire, but more often than not a byproduct of absolute rule.
As the world currently stands, we have multiple countries, competing against multiple religions, all wanting their force their ideals on those around them. The only reason they want to force their ideals on others is because at some point, something important to their beliefs occurred in someone else’s land. Contention ensues, and war begins. People say they want world peace, but it will never happen as long as everyone believes differently.
That is where we step in. As we take over the world, continuity begins. The same military and police forces enforce the rules of the empire. Everyone becomes equal, except for the french who will be crushed into oblivion. Everyone hates france so what does it matter? Childish quarrels over holy lands will cease the moment of detonation. If the land is no longer valuable, the fighting will end. If the fighting continues, both fighting forces will be captured and publicly executed. The message will quickly spread that fighting will not be tolerated, and peace ensues. It has been stated by others, but it applies to this situation, Peace through Domination.
If anyone ever states they want world peace, enlist them into your plans. If they truly desire world peace, they will sign on. If they do not truly desire peace, they will make up some excuse and give you plenty of room. Helping you out either way.