This Fact Sheet analyzes population changes in three Mountain West metropolitan statistical areas (MSAs): Los Angeles-Long Beach-Anaheim, CA; Phoenix-Mesa-Chandler, AZ; and Las Vegas-Henderson-Paradise, NV. Collectively, these three major metropolitan areas are known as the Southwest Megapolitan Triangle. This Fact Sheet illustrates population changes between 2010 and 2018, using data provided by Brookings Institution senior fellow and demographer, William H. Frey, in his report titled, “As Americans spread out, immigration plays a crucial role in local population growth.” By 2019, more than 20 million Americans called this region home
