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There is possible evidence that about 11,000 years ago asteroids impacted the ice sheet of the border of the USA and Canada (and in Europe), and it led to a massive hell on Earth rapid melting of the ice sheet. Although there was already a slow melting of it as temps were rising, the impact threw debris into the air resulting in another cooling era. It would have killed off most of the N. Americans in the USA, some further South could have survived. Also the reason the large mammals like the Woolly Mammoth vanished in N. America and Europe, but not in Africa relative to large Mammals.
This is Washington State, there is really no reason for this landscape as the rest of the state is green, gets lots of rain. The only explanation IMHO is epic biblical massive flooding caused by asteroid impacts.
Everything including soil was ripped away, massive boulders carried a hundred miles downstream.
N. Americans did build this in the USA.
The Great Serpent Mound is a 1,348-foot (411 m)-long,[3] three-foot-high prehistoric effigy mound on a plateau of the Serpent Mound crater along Ohio Brush Creek in Adams County, Ohio. Maintained within a park by the Ohio History Connection, it has been designated a National Historic Landmark by the United States Department of Interior. The Serpent Mound of Ohio was first reported from surveys by Ephraim Squire and Edwin Davis in their historic volume Ancient Monuments of the Mississippi Valley, published in 1848 by the newly founded Smithsonian Museum.
Researchers have attributed construction of the mound to three different prehistoric indigenous cultures. Originally thought to be Adena in origin, a 1996 carbon dating study led scholars to believe the mound was built by members of the Fort Ancient culture around 1070 CE.[4] Most recent dating places the mound at around 300 BCE, once again suggesting Adena construction.[5] Serpent Mound is the largest serpent effigy in the world.[6]
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