While many secularists view the world as overpopulated, Christians know that God has made the earth sufficiently large, with plenty of resources to accommodate all the people He knew would come into existence. All the 5 billion people on the earth could live in the state of Texas in single-family homes with front and back yards and be fed by production in the rest of the United States.
Never mind the question of who's going to run the farms producing the food for everyone in the world once they take up in Texas: there does seem to be plenty of room. Consider Loving County, for example. The Providential plan might save them from the Liberterian threat.