Multiband groups of indigenous people who live outside the control of a centralized state and see themselves as one people with their own sets of leaders and loyalties are referred to

The answer is tribes.

Explanation:

Tribes are described as communities that usually lack legal recognition, and are smaller than a state or country. At present, most tribes remain isolated from modern society, and for this reason they are not involved with legal responsibilities such as paying taxes, although this also means many of them are in danger of disappearing.

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modern american cars are not available due to trade restrictions