Answer
Does the United States still make treaties with Indian tribes?
No. Congress ended treaty-making with Indian tribes in 1871. Since then, relations with Indian groups have been formalized and/or codified by Congressional acts, Executive Orders, and Executive Agreements. Between 1778, when the first treaty was made with the Delawares, to 1871, when Congress ended the treaty-making period, the United States Senate ratified 370 treaties. At least 45 others were negotiated with tribes but were never ratified by the Senate.