Because any civilizations that developed here before would have been washed away once every 100 to 200 years like things were washed away in California, Oregon, Washington, Nevada, Arizona and Utah in 1861 and 1862.
So, since this happens every 100 to 200 years no civilization without the level of technology that we have or more could have survived this without deciding to move away likely in ships to another location where it doesn't wash everything away every 100 to 200 years.
Great Flood of 1862 - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Great_Flood_of_1862WikipediaCalifornia Megaflood: Lessons from a Forgotten Catastrophe
www.scientificamerican.com › ... › Web ExclusivesScientific Americanflood in California - The New York Times
www.nytimes.com/1862/.../the-great-flood-in-calif...The New York Times
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