Most of the blacks headed east bound, to the CA inland empire, Texas, Georgia, Illinois etc.
One of the reasons why crime in LA has been dropping dramatically since 1992.
I would say it's the main reason. It's also why crime in Texas has not fallen anywhere near as much as in the rest of the country, despite a combo of stiffer penalties and increased policing. In 2010, California's per capita violent crime rate was 40% of its 1992 level, whereas Texas's was 55%.