There is not enough money in the world for reparation.
Here is a link to an article that give some idea how many descendants a single couple would have if they began pre-1700...
https://www.wikitree.com/g2g/438140/how-many-descendants-does-a-pre-1700-ancestor-have-67-108-864
Answer - 67,108,864!
Besides not financially feasible it is morally wrong. No one alive (let alone Californians) are responsible for slavery and owe nothing to the descendants of slaves.
I have been researching my genealogy for several years now. It is amazing how many famous people you are related to if you go back far enough.
I have gone back over 500 years on several of my ancestry lines (1,000 years for one line) and have found that I have common ancestors with almost a dozen U.S. Presidents along with English and Scottish royalty. I also found out that my parents were 10th cousins (common ancestors 11 generations ago).