Most of the region eventually came under Mexican rule, until the Treaty of Guadalupe Hidalgo of 1848 gave the United States an area that today includes California, Nevada, Arizona, New Mexico, Utah and Colorado.
The promise of overnight wealth later drew Anglo boosters to the region, especially Las Vegas, where East Coast crime boss Bugsy Siegel set up legal casinos and put the city on the road to becoming a premier gambling destination.
But such success didn’t touch many groups that continued to suffer extreme inequities into the 20th century.
Black families in Phoenix were forced as late as the 1960s to live south of the railroad tracks by racist real estate covenants that barred them from owning property in white neighborhoods. Latinos in Tucson suffered into the 1970s under municipal neglect that razed their barrios for highways or turned them into environmental disaster areas.
And along the U.S.-Mexico border, migrants continued to arrive in the sweltering heat in hopes of getting their own shot at the American Dream, many dying along the way.