When did Sobrante Park, Oakland, California witness a large migration of white residents? 
Sobrante Park, Oakland, California:  It was built shortly after World War II, first as a White-Only Lockout and then gradually becoming a White flight red-zone in the mid to late 50's, and in the early 60's it became a working-class black neighborhood. White flight: White flight is a term that originated in the United States, starting in the 1950s and 1960s, and applied to the large-scale migration of people of various European ancestries from racially mixed urban regions to more racially homogeneous suburban or exurban regions.
mid to late 50's