A housing development sits nestled in the South Mountain foothills in the Ahwatukee neighborhood, in Phoenix, Ariz. The city saw the biggest jump in population in the U.S. between 2017 and 2018.

A housing development sits nestled in the South Mountain foothills in the Ahwatukee neighborhood, in Phoenix, Ariz. The city saw the biggest jump in population in the U.S. between 2017 and 2018.