Few urban duos explain North America’s new economy better than Houston and Monterrey. One concentrates energy power, ports, technical capital, and global access; the other transforms that strength into manufacturing, supply chains, exports, and industrial execution. These are not mirror cities, but complementary ones. As the IMF projects 2.4% growth for the United States and 1.5% for Mexico, the real question is not which country will grow faster, but which metropolitan regio