The Spanish had a mission at Hopewell, Virginia!
DeSoto came as far North as Terre Haute, Indiana, while members of his party actually traveled all the way North to Lake Michigan. Then there's the fellow who put Spanish boundary markers in what is now West Virginia.
This was New Spain!
Here goes:
1. Welsh and Hindi are related languages, with Indo-European roots and similar structure.
2. King Mardoc of Wales lead a flotilla of 700 ships to America in the 600's. 'White men', ie: Welsh, were reported to have traveled into the American midwest.
3. Hence, plains tribes were able to communicate with a Hindi speaker.