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Actually, the population of Japan is about 127 million.

Huh, where did I even get the 300 number? I was sure of it! Kids, don't trust your brain, check the facts you think you know!

>Japan has a population of ~ 300 million

127 million according to Wikipedia.

~300 million is the population of the US

We have 2.5x the population but 25x the landmass. That's an order of magnitude difference in population density. Now imagine a natural disaster.