Anyone with a brain could see it was going to become a problem. Even I predicted it. Demographics is destiny no matter how much civnatcucks scream that it is not and the civil unrest in the last several years among other historical items proves it.
There was no political will to deal with it at the time.
South Africa made the same mistake. They did not secure their borders and they were dependent on cheap labor.
Eventually, the country fell apart.
Maybe we should just cut California loose.