In 1965 we changed the long standing policy of inviting and accepting the brightest and the healthiest of wannabes. We switched that over to preferring the poor, the ignorant, the unskilled, and the just plain Low IQ.
My step-grandparents immigrated from Germany a few years after WWI. He was a skilled machinist and she was a naval architect. Neither knew hardly a word of English, yet they were sort of people the US accepted then and should accept today.
And then we let them bring in their relatives via chain migration. The entire country is going to be one big LA.