Besides, even if we're generous and say that half of California is too mountainous to live in and another quarter is too desert-y to live in, leaving only a quarter of the state's area suitable for habitation, that leaves roughly 40 million people living in roughly 40,000 square miles, or about a thousand heads per square mile. That's comparable to Israel or Belgium in terms of population density, and certainly not as though people are packing into Kowloon.
A city in Japan would build new dense neighborhoods and a new commuter rail line to serve them. A city in California would refuse to build new homes nearby, so people are forced to live in a far-away suburb and commute 2 hours by car. Then Californians complain about increasing traffic congestion.
https://www.reddit.com/r/ImTheMainCharacter/comments/11aqayg...
Japanese people are NOTHING like Americans. Stop saying CA should build like Japan unless you're willing to kick out the loud assholes.