[aikinai]

Professional opportunity or quality of life, most likely. Nowhere else even comes close to the US in terms of professional and economic opportunity.

[4gotunameagain]

In terms of professional and economic opportunity, sure, but in terms of quality of life half of the European countries eclipse the US.

[sys_64738]

That's entirely subjective for sure. The USA is a continent sized country and not a one-size-fits-all like most European countries. Each state should be viewed as its own European sized country with its own warts and all. You will have some backwater, inbred states like AL, MS and GA but places like CA or New England or NY are just eons above anything Europe has to offer. Again, it's all subjective.

[cherryteastain]

Countries like Denmark, Switzerland or Netherlands indeed offer very good quality of life but the language barrier is substantial. Tons of people know English as a second language and almost no one knows, say, Danish as a second language.

[mlrtime]

Then why don't EU countries have the same demand for citizenship as the US? (I don't have numbers, maybe there is?)