Juan Mancias, chairman of the Carrizo/Comecrudo Tribe of Texas, became an international climate figure after a 2017 campaign pressuring French banks to divest from South Texas oil and gas projects. That platform helped him bring in more than $5 million in philanthropic funding for the unrecognized tribe.
A Grist investigation found the historical and genealogical evidence behind Mancias's claim to be hereditary chief cannot be verified. The foundational document he cites cannot be located or authenticated, and documented Indigenous ancestry traces through his maternal line to Mexico in the 1700s, not the paternal line his claim depends on.
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