Great LakesLower Missouri ValleyGreater Rio Grande BasinThese borders overlapped temporarily

Great Lakes:

With the American Revolution

British North Americans embraced Indian allies not out of an ontological disposition but out of contingent necessity. The War of 1812 nurutured a brief revival of mutual dependency. The Rush Bagot Convention of 1817 disarmed the Great Lakes.

Assimilation not acculturation was the highest ideal of republican leaders. Mantaining Missouri as an intercultural borderland was never a goal of American statesmen.

Rio Grande was the last to become a true borderland.

1793, Missouri Company.