That solves the US, for a while. The population growth is slowing globally. When Immigrants arrive in countries who’s majority populations are in, or nearing, decline, their family size adjusts to the local average in a couple generations. Bottom line is that they need people to start making more babies, everywhere. Those at the top do not give a shit about expelling immigrants for real. Industrialists don’t care where their cheap labor comes from. However, they have entered a marriage with a highly xenophobic voter base to stay on top.