Our political class ignores what mass immigration, legal and illegal, will do to the US. They preach multiculturalism and diversity as strengths. The reality is that we are destroying the fabric of this country that will lead eventually to Balkanzation along racial, ethnic, linguistic, and cultural lines.
In 1970 one in 21 was foreign born; today, it is one in 8, the highest in 90 years; and within a decade it will be one in 7, the highest in our history.
I saw this coming long ago. Or rather, Lincoln: "A house divided cannot stand." A country is not defined merely by geography, but by a dominant, shared culture & value system.
Paradoxically, it is the liberals who are going to suffer the most. Diversity was caused by their extreme individualism, lack of loyalty to anything, and hatred of structure and authority. However, they need a dominant culture to prop them up while they're off doing their own thing -- at the same time demanding validation.