"The deepest blue cities — San Francisco, New York, San Jose, Los Angeles and Boston — may be ruled by social justice activists but, according to Pew research, suffer the largest gaps between the bottom and top quintiles. Long-standing minority communities like Albina in Portland are disappearing as 10,000 of the 38,000 residents have been pushed out of the historic African-American section. San Francisco’s African-American black population is roughly half that of the 1970s, constituting less than 5 percent of the city’s population. More than half of the Bay Area’s lower-income communities, notes a recent UC Berkeley study, are in danger of mass displacement."