Manteca is a melting pot for racial integration and spillover, specifically black, Asian, Latino, whites and other races moving to the Central Valley from the San Francisco Bay Area. Just like people move from L.A. to the Inland Empire and the Antelope Valley (Palmdale & Lancaster).
Housing in the Central Valley brings former San Francisco Bay Area residents to find cheaper housing to live in. Manteca will soon be like Palmdale, Lancaster, and San Bernardino.
People from the Bay Area move to the Central Valley to find cheaper housing and Manteca, CA is one example.