Aboriginal title in the United States
Indian Removal Act
The Indian Removal Act of 1830 was signed into law on May 28, 1830, by United States president Andrew Jackson. The law, as described by Congress, provided "for an exchange of lands with the Indians residing in any of the states or territories, and for their removal west of the river Mississippi".
Indian reservation
An Indian reservation in the United States is an area of land held and governed by a Native American tribal nation officially recognized by the U.S. federal government. The reservation's government is autonomous but subject to regulations passed by the United States Congress, and is administered by the United States Bureau of Indian Affairs.
Treaty of Guadalupe Hidalgo
The Treaty of Guadalupe Hidalgo officially ended the Mexican–American War (1846–1848). It was signed on the 2nd of February 1848 in the town of Guadalupe Hidalgo. After the defeat of its army and the fall of the capital in September 1847, Mexico entered into peace negotiations with the U.S. envoy, Nicholas Trist.