I hit return too soon on my previous post.
I followed your link. It indicates that Spanish conquistadors found potatoes in Peru in the 1500’s and introduced them to Europe. Then the potato was brought from Europe to the American colonies. According to the source you linked, Benjamin Franklin (who lived about 100 years after the first Thanksgiving) introduced the potato to the colonies. Thus, as I said before, the potato was cultivated in Europe before the Pilgrims reached America. So I’m not sure how you figure that I was incorrect.