This has sadly happened many times in human history, there is evidence that a comet hit the north american icecap 13,000 years ago which instantly vaporised it causing massive flooding which most likely could have wiped out an advanced civilisation.
This has sadly happened many times in human history, there is evidence that a comet hit the north american icecap 13,000 years ago which instantly vaporised it causing massive flooding which most likely could have wiped out an advanced civilisation.
Yes i agree regressions have likely occurred multiple times to civilizations this being one of the most recent significant one.