I would say Switzerland, and the cultural and economical benefit they received from the mass influx of immigrants into a fairly small country during WWII. Oh w

I would say Switzerland, and the cultural and economical benefit they received from the mass influx of immigrants into a fairly small country during WWII. Oh wait... though, unsurprisingly, a lot of locals were less than amused. Though I know that they are less than amused in many other countries as well, even when the country is pretty large and immigration is minimal.