So the Central Americans are all moving to places where the blacks don't want to live anymore?
Areas where people don't want to live have low rents which are attractive to people who don't have high income. They also go where they might find work in construction - I assume that is the reason for the concentration in Palmdale.You get minorities (not just Hispanics, Blacks as well) in the new, non-posh exurbs in LA. Construction no doubt is a part of it, but it's also where people went who wanted to buy a plot of their own and couldn't afford it, but during the housing bubble could get a loan anyways... but only so far out that things get cheaper again. See also, the Victor Valley and certain places in Riverside County.