California is a very typical example of how immigrants and why immigrants are so important. Pretty much bulk of California's riches come from start ups and companies founded by Immigrants.

Also California is an exception that so much good talent shows up every single year, year after year. Its not that hard for a state to match the economy of other powerful nations if the best students, from the best universities of every single country on earth show up with aim of doing good work. Progress happens so rapidly and at such scale because of disproportionate concentration of best of human race in a small place.

If the same goes to some other place in an another country, same results will happen there. And this can happen pretty quickly. Start ups are not that hard to do these days.

California has way higher talent density of awesome people in a small place for a state.