That is the point isn't it? European countries finally start catching up to the US in the size of their immigrant population, and all of a sudden you're seeing massive social upheaval and populist movements popping up everywhere.
No. Several European countries have had significant foreign-born populations for a long time.
https://www.statista.com/statistics/549292/foreign-born-popu...
However, a person from a neighbouring country (e.g. Mexico) would count as an immigrant in the US.
Just because states are massive in the US doesn't make them equivalent to different countries in Europe, which all have their own language, ethnic background, and culture. A German person moving 350 miles to Italy (from Munich to Venice) is definitely an immigrant, with a completely different background, even though the distance itself isn't even enough to go between Austin and Houston in Texas.