The Mandan are visited in 1796 by…
1797 CE
Numerous European Americans hold that there are "Welsh Indians" in these remote areas, a persistent myth that is written about widely.
Evans had arrived in St. Louis two years prior, and after being imprisoned for a year, had been hired by Spanish authorities to lead an expedition to chart the upper Missouri.
Evans has spent the winter of 1796–97 with the Mandan but has found no evidence of any Welsh influence.
In July 1797 he writes to Dr. Samuel Jones, "Thus having explored and charted the Missurie for 1,800 miles and by my Communications with the Indians this side of the Pacific Ocean from 35 to 49 degrees of Latitude, I am able to inform you that there is no such People as the Welsh Indians."