The history of the Osages from 1808 to 1839 may be conveniently divided into three major sections, each separated by a cession treaty. The first begins with the cession treaty of 1808 and terminates with the cession of 1818. It covers the Osages' relations with the whites and the eastern tribes during that decade. The second section begins with the 1818 session treaty and ends with the land cession of 1825. It likewise covers the tribe's relations with the eastern tribes and the whites. The concluding division covers the period from the Osages' last major cession treaty to their removal to Kansas in 1839, and includes their relations with the eastern tribes, the western tribes, and the whites. These three sections combined cover the most turbulent period in Osage history, a period in which the United States Government and the powerful eastern tribes took the extensive Osage lands by right of conquest.