I pretty much agree with Two Cents that there's (almost) nowhere left for Americans to run.
Aside from Canada -- which is an excellent choice and a do-able immigration option from the States -- most other top picks are shut down to attempts by Americans to enter for more than a few weeks as money-spending tourists.
The UK and the rest of Europe have very stringent entry requirements -- you can't just rock up, and there's no such thing as an application form for residency and/or employment for people who aren't already EU citizens. Well there is, but on applying you have to prove that you are (a) married to a European citizen, (b) the child of a European citizen, (c) a famous and wealthy artist/actor/musician, or (d) a well-heeled entrepreneur with an intention to create a corporation here.
The only other option for residency application (without the right to employment) is to prove that you are self-supporting with an unearned income to the tune of 50,000+ US Dollars a year.
Or else you have to be one of the top employees at an international American blue-chip company that's willing to pay and sponsor your temporary work visa (and you have to remain with that employer, oh, forever).
Those are the rules pretty much throughout Europe. It's overcrowded here and not enough jobs to go around, so they're not letting anyone else in from outside its own borders -- and if they do let any non-EU people, they have to be from Commonwealth countries or ex-Dutch or ex-French colonies (the Caribbean, India, Pakistan, Angola, Egypt, Australia, New Zealand, Malaysia, Sri Lanka, Zimbabwe, etc). People from the Far East, the US, and Central America just haven't got a chance unless they get married to a European.
New Zealand, however, down round the other side of the globe, suffers from different skills shortages because their population is quite low. If you check their government website for visas available, at different times they're looking for decent, hard working native-English-speaking people with different levels of skills and expertise. NZ is a brilliant option and certainly worth looking into.
And nowhere, nowhere, nowhere is as breeder-centric as America. Plus I'm afraid I have to agree with those of you who've voiced this -- America is headed down the shitter.
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"The death of creativity is a pram in the hallway"
- Cyril Connolly