If 100% of the country was returned to tribal nations under the ideology of land back, it would abolish private property and return land to common ownership. This is generally an aim of communists. It wouldn't mean "all white people lose political power forever", because the people living there would join the political structure of the nations. It would be a revolution in terms of food production, private property, and protecting the environment. It isn't inherently a marxist movement though, from my understanding

Take a second and ask yourself why Indigenous peoples are excluded from your definition of the proletariat.

These so-called "tribes" are actually indigenous nations that have their own identities and practices. Both Vietnam and China had to fight wars against colonialist forces before their revolutions. This was a necessary step in their communist development. Decolonization will be a different process in the United States (and other settler-colonial countries) because the colonizers have been here for so long, but the movements for sovereignty have already begun. Native peoples have been fighting this entire time and have already achieved some results, including hunting and fishing rights finally being honored from the "treaties" made in the 1800s.

I have not read it, but from what I hear Marxism and the National Question by Stalin is a good resource here.

These are not mutually exclusive. Tribal stewardship can be excellent in rehabilitating ecosystems and working to curtail the effects of industrial development.

the land is controlled by a dictatorship of the proletariat using dialectical materialism for the common good

So the indigenous nations, you literally just answered your own question

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