We do need immigrants because without it our population would decrease. Economically, that's not really ideal or good.
In a perfect world, you want about 1-2% population growth and 3-4% economic growth. That's "humming" in an established economy like ours. You want 4-5% interest rates. You want people to have some degree of savings and low short-term debt. You want home ownership. You want manufacturing to be 20%+ of the workforce.
I mean, this isn't hard. In a free market economy it often happens on its own with little to no government intervention and solid regulations and enforcement. You just can't rock the boat.
I've been around now watching and being part of the economy for 30+ years. It shocks me how many bad decisions happen on a macro-economic scale with our government. How much they "try to help" and it just really makes it worse (or helps much to little for the amount spent).
I love Trump and his economy (its much better than anything under Obama) but there are kinks in the armor. We need to control fed spending. The top tax bracket didn't need to be lowered. With more income and less spending, the fed can raise interest rates to more healthy levels. We need to cut social programs. When the economy is good you need to CUT fed spending. The people can take care of themselves. Jobs are there. States are making good revenue to make things work.
But immigrants are an important point of economic growth. The key is more growth than population increase.
