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What would the United States be like today if the US Constitution was written with provisions to admit Native American nations as official states, instead of the nebulous semi-legal status they were given in our timeline? Obviously, there'd have to be certain criteria (population, willingness to inhabit a defined area within the new state's borders, etc.).
This might be a more complicated issue with the migratory tribes of the Great Plains, but there were many "civilized" (in multiple senses: agriculture-based permanent settlements, strong internal political organization, and also the un-PC sense of westernizing) tribes, such as the Cherokee and the Iroquois, that would be ideal candidates for an indigenous US State.

I'd imagine that it would result in United States that would have more quickly embraced cultural/racial/religious pluralism. Although ironically, it might have prolonged slavery in the US, as a Cherokee State (and perhaps other tribes) would add to the pro-Slave votes in Congress.

Thoughts?
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