This article from fivethirtyeight analyses California's shift from Republican to Democratic in depth. Some interesting passages:

Southern California was Republican-leaning, largely because the defense industry was a major economic engine [...] In the early 1990s, defense spending began to fall, and numerous military bases in California were closed. This helped spark an out-migration of mostly white, affluent and Republican-leaning residents, including many former defense-industry workers.

[...] The influx into California of Hispanics and Asians had an even larger effect. Between 1980 and 2000, California’s Hispanic and Asian communities each doubled as a share of the state’s population.

[...]Its main economic drivers were changing. Although agriculture remains a major industry, defense faded and Hollywood and Silicon Valley grew. California saw an influx of highly educated young professionals.

This article from fivethirtyeight analyses California's shift from Republican to Democratic in depth. Some interesting passages:

Southern California was Republican-leaning, largely because the defense industry was a major economic engine [...] In the early 1990s, defense spending began to fall, and numerous military bases in California were closed. This helped spark an out-migration of mostly white, affluent and Republican-leaning residents, including many former defense-industry workers.

[...] The influx into California of Hispanics and Asians had an even larger effect. Between 1980 and 2000, California’s Hispanic and Asian communities each doubled as a share of the state’s population.

[...]Its main economic drivers were changing. Although agriculture remains a major industry, defense faded and Hollywood and Silicon Valley grew. California saw an influx of highly educated young professionals.

This article from fivethirtyeight analyses California's shift from Republican to Democratic in depth. Some interesting passages:

Southern California was Republican-leaning, largely because the defense industry was a major economic engine [...] In the early 1990s, defense spending began to fall, and numerous military bases in California were closed. This helped spark an out-migration of mostly white, affluent and Republican-leaning residents, including many former defense-industry workers.

 

[...] The influx into California of Hispanics and Asians had an even larger effect. Between 1980 and 2000, California’s Hispanic and Asian communities each doubled as a share of the state’s population.

 

[...]Its main economic drivers were changing. Although agriculture remains a major industry, defense faded and Hollywood and Silicon Valley grew. California saw an influx of highly educated young professionals.

This article from fivethirtyeight analyses California's shift from Republican to Democratic in depth. Some interesting passages:

Southern California was Republican-leaning, largely because the defense industry was a major economic engine [...] In the early 1990s, defense spending began to fall, and numerous military bases in California were closed. This helped spark an out-migration of mostly white, affluent and Republican-leaning residents, including many former defense-industry workers.

[...] The influx into California of Hispanics and Asians had an even larger effect. Between 1980 and 2000, California’s Hispanic and Asian communities each doubled as a share of the state’s population.

[...]Its main economic drivers were changing. Although agriculture remains a major industry, defense faded and Hollywood and Silicon Valley grew. California saw an influx of highly educated young professionals.