Origin of Civilization in 'Merganser'

In the real world, agriculture was almost certainly brought to the northern plains and the western Great Lakes by the Mississippians. Iroquoian agriculture was probably brought up from the Southeast before the Mississippian civilization had arisen.

However, in the setting of 'Merganser,' the most agricultural technologies seem to have originated in the Missouri River Valley, among the Mandan and Hidatsa people.