It doesn't make much sense. California doesn't have a super high median income or GDP per capita compared to other rich US states. The US has around a dozen states with median incomes equal to or higher than Switzerland.
California ranks #8 in GDP per capita in the US among states. It's around $59,000 for 2017, which is high globally but not particularly high vs the overall US figure of ~$57,000.
California ranks near the bottom in education and is 35th in poverty rate.
The title of most developed US state goes to Massachusetts most likely. It has a super high GDP per capita and median income, and is generally highly developed in most regards including education, poverty, and median standard of living. The problem is, it's the size of a Scandinavian nation. New Hampshire is even worse: they have one of the world's highest median incomes and GDP per capita figures, but only 1.3 million people.
