The purpose of treaties between the U.S. Government and Indians was to first of all keep peace between the two and give colonists permission to settle Indian land. Hope this helps!
Answer:
Louisiana purchase on April 30, 1803, Texas annexation on December 29, 1845, Gadsden Purchase on December 30, 1853, Mexican Cession on February 2, 1848, and the Adam-Onis Treaty on February 22, 1821
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