"Each year, on average, 31,000 square kilometres (12,000 sq mi) (around 21% of the country) is flooded. During severe floods the affected area may exceed two-thirds of the country, as was seen in 1998."
https://en.wikipedia.org/wiki/Floods_in_Bangladesh
Most of the world does not want to aspire to be Bangladesh, but humans have been living in extremely disaster-prone areas for millennia because the short-term benefits (rich soil etc) outweigh the occasional catastrophic losses.
And, well, most of the US is just a hanger-on to California's economy.
CA is a huge economy but by no means is the US just CA + 49 other states. Might be fairer to say it’s CA+NY+TX+FL but at that point you’re just aggregating the population.
Living in areas in constant danger of flooding and/or burning and/or storm wind damage and/or drought seems like quite an eccentrically inconvenient lifestyle flex.
Unless you like disaster movies.
This is like half of the country.