Give peace a chance!

Julia asked:  Do you think it will ever be possible to have universal peace?

I'm all for John Lennon and the hippie people from the 60's saying "hey hey give peace a chance" but I don't think it's a realistic concept.  Most countries that are at war is because of a stand point with governments or because of disagreements in just about everything.
I personally think for universal peace to even remotely happen, the world has to have a set type of government (no one person in rule, no one person killing everyone creating a war in their own country), and honestly most likely one established religion.
Even though it would be able to be down without the religion factor, I feel the world needs to come together as one, under one government.

Now I'm thinking if the world was together, like the United States, wars would probably STILL break out!  California could bomb Florida because they attract more people for spring break or some other stupid reason.  No matter what, the world, countries, hell even cities and states are going to have something that pull them apart and set them up against each other.

Do you think people are peace advocates because of the hope for peace?  Or because they think it can actually happen?