Sorry I prematurely sent that one...
As I was going to say, I don't believe we'll every be a world government, see: "Could the European Union become a supercountry?" I think that will better explain some of the one world government BS.
First about the UN, EU, and NAFTA. The EU for now, and defiantly NAFTA are STRICTLY free-trade alliances. You'll never see an integrated US, CANADIAN, MEXICAN military force. For America is too far ahead, and has its own foreign policy goals to reach. The EU I'm a little bit more worried about, with a united currency, and talks of their own military this could become a continental European state. I hope not.
The UN for that fact isn't a front for the One World Government, this is to work out problems primarily between first-world governments, and to create a communications link between the first and third-world. Not worried about the UN. Plus lately the US has been vehemently pulling away from the UN, at this rate by 2011, we'll be out of it. I hope that doesn't happen.
I commented about Isolationist America, in "BUSH PISSES ME OFF", which is inside this forum.