When the 22nd century arrives, Trump will be revered for stopping the US and the West from getting run over by hordes of uncivilized "immigrants".
lots of hispanics are racially white, there are plenty of culturally white asians, and most muslim immigrants to the us are not refugees, but have average if not above average incomes. The culture will be nudged a bit, but it will be recognizable; if the arrival of a new ethnic group destroyed the american culture we would be living in the United States of New Ireland
We are not europe, the american culture is not tied to a single ethnicity and hasn't been since the irish assimilated, and as much as you wish for an express landbridge between the US and Syria so that you can get rock hard by screaming 'OUR CIVILIZATION IS BEING DESTROYED REEEEEEE'. Its not happening, it didn't happen under obama, and it won't happen under the next democratic president.
We share thousands of miles of border with Mexico and the globalists are still forcing most countries to accept "refugees".