Foreigners coming legally are on average smarter, less lazy, harder working, and more pro-America than born in USA Americans. I have come across at least 10,000 people during my working career in industry, and that is my observation. My company of 1500 employees manufacturing heavy machinery promoted me to the top spot in engineering because I proved to them I worked harder, was smarter and more educated with a masters degree in engineering which no one had in the outfit. The owners were smart, they did not care I spoke with a foreign accent. They were only interested in success in their business. But the jealousy of some born in USA workers in the outfit was ugly.
What you fail to understand is that there is more,much more, to a nation than its economy. How would your people like it if millions of Japanese immigrated to the place where you came from and changed it into Japan v2.0? Oh wait, I’m sure your native country would never allow that.