Treaty of Hoe Buckintoopa
The Treaty of Hoe Buckintoopa was signed on August 31, 1803, between the Choctaw (an American Indian tribe) and the United States Government. The treaty ceded about 853,760 acres (3,455.0 km2) of Choctaw land.
Source: Wikipedia — Treaty of Hoe Buckintoopa (CC BY-SA 4.0)