The southern U.S. has the highest rainfall, year-around crop growth, abundant/cheap freshwater, and due to high humidity, is probably the best equipped for high

The southern U.S. has the highest rainfall, year-around crop growth, abundant/cheap freshwater, and due to high humidity, is probably the best equipped for higher temperatures thanks to universal air conditioning and heat pump installation. The western U.S. is where problems are going to arise first.