Sorry to interrupt this thread, but....
Are you mad? The "Brits" as you say it, did not give us this country or the people who founded it; far from it. Some people fled (I stress FLED) Britain, France, etc. to get away from the Monarchy and experience true freedom, religious or otherwise. I am not sure if you heard, but there was this thing called the American Revolution. This involved us (Americans, or those who fled their respective countries) fighting to claim the territory that we now call the United States.
Furthermore... Here are just a few of the things that the US has contributed to the world: the light bulb, Rubber, the airplane, the transistor, nuclear power, the personal computer, online shopping, the iPod, THE MRI, and many, many others...
. Do you use any of these? Who cares about football, or rugby, or the postage stamp (boring!). The statement that Brits invented the TV can be disputed; there is no definitive proof of that either way as it is a much disputed claim. The jet engine can also be disputed; technically Hans von Ohain (German) beat Whittle to the punch, which leads to the train. Yes, this also can be disputed. Just because somebody files for the first patent, doesn't mean they invented it, or "gave" it to anyone.
Americans certainly have their flaws (Bush...), and they seem to be getting worse by the decade, but we have definitely contributed to this planet in some good ways as well, not just bad.
What would be the point of having "Her Majesty" be our head of state? What does she and the rest of the royal family really do but cost British tax payers £37.4m ($70,000,000 USD) last year alone?!!? No thanks, its bad enough having a bunch of already rich Senators and congressman giving their selves raises every year (like they need the money?).