Earlier quoted context omitted.
It's about money and everything else too. US is a really nice country to live in for high skilled individuals. An immigrant nation who speaks the international language, a fast growing economy, especially in cutting edge tech, with overall taxes lower than Europe and even the housing market crisis is not at bad as what you will encounter in many European cities. And its huge so for a lot of emigrants looking for a ne…
Don't most people in Denmark - and pretty much all Nordic countries - speak English?
In any other gathering they will obviously prefer their own language. In countries like France, Germany, Italy out is not possible to live a normal life without being at least moderately fluent in the national language.