As Hispanics are trafficked here to fill the growing voids between urban cores and suburban whites, they are displacing blacks in the workforce (including government set-aside jobs and contracts), political offices, neighborhoods, the drug trade (and related prisons)...some blacks leading up to the 2016 election finally seemed to realize they were losing badly with the open border.
SoCal blacks have known for years that illegals are replacing them. They have been as powerless to stop it as SoCal whites have been at halting the demographic transformation of California. Powerful groups in business and politics get what they want.
The old black neighborhoods of South Central LA are mostly latino. Blacks left for places like San Bernardino.