The arid landscapes of America's deserts, once considered inhospitable frontiers, now host thriving metropolitan areas. According to the U.S. Census Bureau, over 9 million people call these xeric regions home, creating a fascinating intersection of human adaptation and desert ecosystems. America's Major Desert Regions The Environmental Protection Agency's ecoregion data identifies four major desert regions in the United States: The Sonoran Desert: Home to approximately 3.8 million residents, including the Phoenix metropolitan area, America's largest desert city. The National Park Service notes this desert receives biannual rainfall, supporting the iconic saguaro cactus and diverse wildlife. The Mojave Desert: Housing 2.3 million people, including Las Vegas. The U.S. Geological Survey identifies it as North America's driest desert, yet it supports major urban centers through extensive water management systems. The Chihuahuan Desert: With 2.5 million inh...