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German settlers recorded Yankton land extended east into Minnesota to the Jeffers Petroglyphs

Stone monument on grassland hills — Treaty of 1858 monument in Charles Mix County, South Dakota

The Yankton Treaty was a treaty signed in 1858 between the United States Government and the Yankton Sioux Tribe (Western Dakota), that ceded most of eastern South Dakota (11 million acres) to the U.S. Government.^[1] The treaty was signed in April 1858, and ratified by the United States Congress on February 16, 1859.

^ Indian Affairs: Laws and Treaties, Compiled and Edited by Charles J. Kappler, Oklahoma State University (OSU) Library Electronic Publishing Center.