The advent of the Hart-Cellar act was the start of the trip down the toilet. Prior to that time, the immigrants were tightly controlled. We accepted only the best. That was the reason we held immigrants in high regard. Hart-Cellar opened the door to the dregs and chain migration of families. The quality control went down the crapper. We need to return to the old policy.
Every sane country in the world, including those with lots of open space like Canada, Australia and New Zealand, stresses quality as the main condition for an immigrant visa.
While quality has absolutely nothing to do with race, quality immigrants tend to come from places where qualities like education and self-sufficiency are part of the culture. Most of those places tend to be where there are a large number of Asians and white people (whatever that means).