Excerpts from Books and Wikipedia
"The defeat and death of Tecumseh at the Battle of the Thames on October 5, 1813, and the slaughter of the traditionalist Red Stick Creeks at Horseshoe Bend on March 27, 1814, marked the end of the serious military power of the American Indians in the Northwest and Southwest respectively. . . . In June 1815, the Madison administration ordered Andrew Jackson to begin to return to the Creeks the lands taken from them by his treaty, But Jackson raged and refused to obey, and the government felt loath to enforce its edict upon a popular hero supported by white public opinion in the Southwest. . . . By a series of such treaties in the years immediately after 1814, Jackson obtained vast lands for white settlement. A historian had estimated his acquisitions as three-quarters of Alabama and Florida, one-third of Tennessee, one-fifth of Georgia and Mississippi, and smaller portions of Kentucky and North Carolina." [Howe: What Hath God Wrought, p. 74-76]