<Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> The territorial boundaries claimed as sovereign and controlled by the Indian nations living in what were then known as the Indian Territories--the portion of the early United States west of the Mississippi River not yet claimed or allotted to become Oklahoma--were fixed and determined by national treaties with the United States federal government . These recognized the tribal governments as dependent but internally sovereign, or autonomous nations under the sole jurisdiction of the federal government . </P> <P> While retaining their tribal governance, which included a constitution or official council in tribes such as the Iroquois and Cherokee, many portions of the southeastern Indian nations had become partially or completely economically integrated into the economy of the region . This included the plantation economy in states such as Georgia, and the possession of slaves . These slaves were also forcibly relocated during the process of removal . A similar process had occurred earlier in the territories controlled by the Confederacy of the Six Nations in what is now upstate New York prior to the British invasion and subsequent U.S. annexation of the Iroquois nation . </P>

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