US has a population of approx 300M 118M tax payers and 65M retirees. Our citizens average 2 kids. Just enough to maintain our population but not enough to increase our tax base. Open up immigration and Sell 140M US citizenship at $100K a piece requiring the immigrants to purchase a house within 1 year. These well to do immigrants will bring money and create new businesses here. They will buy up all of our housing excess and generate 14T in immigration fees. The US population will increase from 300M to over 500M and increase the tax payer base to 250M. Solves the illegal immigrant issue... Pay up or get deported.