The Treaty of Fort Clark (also known as the Treaty with the Osage or the Osage Treaty) was signed at Fort Osage (then called Fort Clark) on November 10, 1808, (ratified on April 28, 1810) in which the Osage Nation ceded all the land east of the fort in Missouri and Arkansas north of the Arkansas River to the United States.
The Treaty of Fort Clark (also known as the Osage Treaty or the Osage Agreement) was signed at Fort Osage (then called Fort Clark) on November 10, 1808, and ratified on April 28, 1810. In this treaty, the Osage Nation surrendered all land east of the fort in Missouri and Arkansas north of the Arkansas River to the United States.