My thought is that because of 9.0 Earthquakes in the Cascadia area (northern California to Canada) every 300 to 1000 years, (AND) Major earthquakes in California every 20 to 25 years or so(6 to 7 pointers at least (1906 San Francisco Quake, Loma Prieta Quake, Northridge quake, 1971 quake in Sylmar etc. (AND) every 150 to 300 years there is a devastating Flood which would wash away any city (except places on hills like San Francisco and where the Sacramento River is 20 miles wide and 300 miles long like this into Sacramento (One is expected any time now caused by atmospheric rivers of rain coming down for 40 days at a time). This also affects Fresno, Bakersfield, San Diego, Los Angeles, Santa Barbara, Ventura (all over the state where rivers and streams are part of the year).
So, why were there not large cities (at all) on the West coast of the U.S. and Canada in 1500?
Because if there had been at one time they all would have been washed away or shaken down by earthquakes or floods every 150 to 300 to 1000 years that's why. So, my thought is there may have been cities before but they were destroyed. For example, colonists could have sailed to the U.S. or Canada from China or Hawaii or wherever before but even if they built a city or a colony eventually it would have been destroyed. Now we face such an outcome too in some areas of flood plains or near fault lines or subduction zones throughout the west coast of the U.S. and Canada.
- The Great Flood of 1862 was the largest flood in the recorded history of Oregon, Nevada, and California, occurring from December 1861 to January 1862.This type of flood is historical for the whole west coast of the U.S. all the way into Utah, Arizona and Nevada as well as California, Oregon and Washington. It happens every 150 to 300 years like clockwork. Scientists have studied these events just like the every 300 to 1000 year events of 9.0 Cascadia subduction events with extreme Tsunamis that usually accompany these events all across the Pacific Ocean and onto land in Washington, Oregon and California and Canada.
- The 1994 Northridge earthquake occurred on January 17, at 4:30:55 a.m. PST and was centered in Reseda, a neighborhood in the north-central San Fernando Valley region ...
- The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in ...
- The 1989 Loma Prieta earthquake occurred in Northern California on October 17 at 5:04 p.m. local time. The shock was centered in The Forest of Nisene Marks State Park ...The 1994 Northridge quake I didn't experience because I lived in Northern California then.However, the 1971 San Fernando Earthquake had to be the most terrifying experience of my life (and I wasn't even near the epicenter). It started around dawn of the day and it was still dark and woke me up. The shaking built and built up to the point where I was bouncing around on my bed and trying not to hit my head on the wall. I knew enough not to get out of my bed because I knew likely I would be more injured if I tried to walk. At the time I thought a nuclear war had begun because the shaking went on and on and on for minutes which means a really really big quake.My ex-wife was near the epicenter with her first husband and they were going to college and all their college books fell off the book shelves on top of them and injured them. Then their window broke and they looked out and all the cars parked were moving and telephone and power lines were sparking and falling down along with telephone poles. It was 5 or 6 am so people were not out so this saved a lot of lives because an hour later it might have killed thousands during a rush hour commute.On the other hand I knew the Loma Prieta quake was coming and flew my family to Maui and watched the whole thing on TV in Hana, Maui as it happened.
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