I'm not sure it's that easy. For one, it might not be a lot better where you're from. But more importantly, your presence also can influence (small impact on an individual's level of course) where things are going. There's also the issue that depending on your field there's simply more interesting jobs available locally in the US than in a lot of other countries.

I moved to the US ~a year ago, now as a permanent resident. Debating on what to do if things continue going down along the current course.