And while we do have liberal emigration policies, the bureaucracy involved cannot be underestimated.
There are another things going on that you will find violations of your privacy - Uruguay has a nationwide ID program with fingerprinting (and probably DNA in the near future).
We don't have cameras or backscatter machines yet, but the current wave of insecurity will probably make people clamor for them soon - weird statistic: you're ten times more likely to be murdered in the U.S., but almost twenty times more likely to be robbed in Uruguay (I had my laptop stolen last month, for example).
The current government isn't likely to cave in easily to the U.S. government, but what about the next one?