The idea that immigration is declining due to social and political issues lacks perspective.
Despite all the rhetoric, the US is high among the most equitable, least racist, safest and politically free countries in the world.
If immigration regulation were relaxed, there would be a flood of well-educated people from China, India and many other nations.
On the other hand, immigrants from western Europe don't have much to gain from moving the the US. They basically would be trading higher salaries for higher expenses.