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Yeah sure. It never happened that a great civilization completely collapsed.

I mean, Japan has been through a few 'collapses' in it's written history. The most recent arguably being in 1945.

Sure but I was thinking about more wide-scale collapses like Egyptians or Mayans.

and then the US invested heavily -- and still does, via military presence -- to build Japan back up to block the Soviets.

who will build them back up in the future? The Chinese would prefer to see them poor.