The Chickasaw Nation was one that was an amalgamation of both
African Americans and Native Americans. However, they were never
given citizenship in the Chickasaw nation.
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No. Same-sex marriage is explicitly forbidden by Chickasaw
law.
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As far as I know it was Cyrus Harris.
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The Chickasaw Nation derive their name from one of their leaders by that name. It is the English language spelling of Chikashsha, meaning "rebel" or "comes from Chicsa".