Cherokee Nation v. State of Ga.
"Though the Indians are acknowledged to have an unquestionable, and, heretofore, unquestioned right to the lands they occupy, until that right shall be extinguished by a voluntary cession to our government; yet it may well be doubted whether those tribes which reside within the acknowledged boundaries of the United States can, with strict accuracy, be denominated foreign nations. They may, more correctly, perhaps, be denominated domestic dependent nations. They occupy a territory to which we assert a title independent of their will, which must take effect in point of possession when their right of possession ceases. Meanwhile they are in a state of pupilage. Their relation to the United States resembles that of a ward to his guardian.
They look to our government for protection; rely upon its kindness and its power; appeal to it for relief to their wants; and address the president as their great father. They and their country are considered by foreign nations, as well as by ourselves, as being so completely under the sovereignty and dominion of the United States, that any attempt to acquire their lands, or to form a political connexion with them, would be considered by all as an invasion of our territory, and an act of hostility.
These considerations go far to support the opinion, that the framers of our constitution had not the Indian tribes in view, when they opened the courts of the union to controversies between a state or the citizens thereof, and foreign states."
Indian Removal Act, 4 Stat. 411 (1830).
In 1830, Congress passed the Indian Removal Act in order to relocate eastern tribes to the West. Congressional control over the Native American tribes expanded with the enactment of laws emphasizing the "education and civilization" of Indian children in order to assimilate Native American culture into that of the majority culture.