One must ensure they stay on the good side of The Leader. Im waiting for Trump to die so I can see if the Republican party becomes a true European style populist party (America first, against most immigration, focus on the working class, anti-intellectual, anti globalism).
The US has gone through periods of isolationism and being anti-immigrant. Thats nothing new. I think the last time was the 1920s. There are interesting ideas that it has to do with American over-involvement in world affairs and reaching a certain threshold for immigrants as part of the US population.