How did Joanne Nagel explain the increase in the number of people identifying themselves as "American Indian" when birth rates stayed the same?

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Joanne Nagel argues that the increase in the number of people identifying themselves as "American Indian" is partly due to the impact of the "Red Power" movement in the 1960s and 1970s, which challenged negative stereotyping and encouraged American Indians to reclaim their heritage and assert their identities. This implies that the shift in self-identification was a result of social and cultural factors, rather than changes in birth rates or migration patterns.

How Did Joanne Nagel Explain the Increase in the Number