Perhaps the best take on how extremely rapidly Texas’ population is growing comes from this chart I did back in March when the Census released numbers on county-level population growth:
Four out of the top 10 is a lot! But this list should also call into question how special Texas is. The odd man out on this list, in some ways, is really Wake County in North Carolina. Otherwise, if you ask yourself what do Los Angeles and the Inland Empire and Phoenix and Houston and Dallas-Fort Worth and Las Vegas all have in common, you’re not going to come up with a policy variable. This is roughly speaking the “Close to Mexico” portion of the United States.