Acutally I think the US could conquer teh world. If it decided to dominate, and exterminated the populations of host countries. they have the firepower, technology, money and more than enough men to do it, IF they decided to be conquerors, like the Mongols, instead of 'regime changers'...
Sure they'd be loads of ground roots resistance, but as the US could monopolise satellite technology, and probably freeze the internet too, these annoyances would remain at ground level. The better organised might even ahve radios, but the US is more than capable of occupying the areas it wants, and elaching the resources, if it so chose.
And what if the US adopted mercantilism??? Hah, that'd be a huge economic F*ck you to the rest of the world....
My only criticisms are that the US says one thing and does another, or just plain out lies (Iraq was under false pretences, i.e. lies, regardless of what greater good may come out of that) but then again, we Brits do that to, and so does everyone else infact.
Just that, we;'re not claiming to be the bastion of freedom or whatever.We're honest liars!!
)... after having declared war on the rest of the world, where exactly do you think America is going to get all that oil to power that enormous war machine of theirs? 
). We can choose to ignore the tiny islands as they would have a negligable population in terms of a domination victory. To take out all of Europe, South America and Africa would be trouble enough, but then you have the vastness of India and China to take into acount. Australia would alos be strangely troublessome, as the poulation is all round the outer part of the island, so you'd have to use a disproportionatly high number of nukes.
after all, and power shifts from time to time.
