In 1806 the Louisiana Purchase was open territory with no settlement except for Native American villages. So, the answer to your question is none.
corn
Zuni
Native American(Southwest)
Many Native American tribes used irrigation. Two of the largest were the Cherokee of the east coast and the Hohokam of the American Southwest (Phoenix area).
Pueblo.
In 1806 the Louisiana Purchase was open territory with no settlement except for Native American villages. So, the answer to your question is none.
MIWOK
Anasazi
southwest
The Omaha tribe was the Native American group that had trading villages on the Missouri River. These trading villages were greatly affected by a smallpox epidemic, killing a significant proportion of their populations.
corn
Christian missionaries.
Jesuit missionaries
Southwest food is mainly of Mexican or Native American origin and/or influence.
Many Native Americans were killed and displaced during the settlement of Caucasians in the west.
Jesuit missionaries