Summary

Thurgood Marshall Choctaw Nation v. Oklahoma — Opinion of the Court

The prospect of the voluntary removal of the Indians to land west of the Mississippi soon disappreared. For the most part, the Choctaws and the Cherokees who had not already left their eastern lands refused to give up the land that had long been their home. The abortive attempt to set aside Arkansas Territory land for the Indians justifiably made many of them doubt that the United States would protect them in their new lands. But at the same time the Indians were deciding to remain, the new settlers' expansion and desire for their lands increased.
Source: Wikisource

Thurgood Marshall Choctaw Nation v. Oklahoma — Opinion of the Court

Once again, the United States assured the Indians that they would not be forced to move from their new lands: a patent would issue to convey those lands in fee simple, and they would never be embraced within the boundaries of any State or Territory.
The United States thus succeeded in its efforts to remove the Indians from their eastern lands. In exchange, by the Treaty of Dancing Rabbit Creek with the Choctaws in 1830 and the Treaty of New Echota with the Cherokees in 1835, the United States granted a vast area of its western territory to the two Indian Nations.
Source: Wikisource

Thurgood Marshall Choctaw Nation v. Oklahoma — Opinion of the Court

Finally, it must be remembered that the United States accompanied its grants to petitioners with the promise that 'no part of the land granted to them shall ever be embraced in any Territory or State.' In light of this promise, it is only by the purest of legal fictions that there can be found even a semblance of an understanding (on which Oklahoma necessarily places its principal reliance) , that the United States retained title in order to grant it to some future State.
Source: Wikisource

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