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In page Mandan, Hidatsa, and Arikara Nation:

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Membership (Citizenship) is derived from the 1936 Indian Census roll of the Three Affiliated Tribes. In 2010 the tribal membership passed amendments specifying "blood quantum," or minimum amounts of tribal ancestry to qualify individuals for membership and for candidates for public office. Effective December 16, 2010 individuals must have at least 1/8 Mandan, Hidatsa, or Arikara ancestry (the equivalent of one full-blooded great-grandparent) to become an enrolled member of the MHA Nation and 1/4 ancestry to serve in elected office. [1]