Reminds me of some of Frederick Remington’s observations about the Mandan peoples, with whom he lived for a couple of years. Seems a lot of words in the Mandan language are very similar to Welsh and the Mandan peoples, unlike other American Indian tribes, built their villages on peninsulas protected by water, in much the same manner as the early Welsh. (See Madoc/Madog ab Owain Gwynedd, a Welsh explorer who, according to legend, sailed west from Wales in 1170.)
IIRC, the Mandan women were known for their . . . friendliness.