Earlier quoted context omitted.
The USA, for being appealing enough to make Linus want to (first) move here and (now) take on citizenship, instead of just telnetting from Finland - or anywhere else on the planet he might have liked better.
Or being so inflexible with regard to immigration that the only way to work there without facing immediate deportation if you change jobs is to become a citizen. I can live and work permanently in 27 countries (including Finland) without having to change nationality.
All I had to do after I moves was to register with the local city authorities to indicate that I had moved there, and provide documentation proving that I had a job so that they knew they didn't have to put me on social security.
One might also make the counterpoint that while we can move between 30 states in the EEA US citizens can move between 50 states in their union, and their superstate comprises almost twice the surface area of the EU.