 From the north bank of the river opposite Kaw Point in what is today Kansas City Downtown Airport he was instructed to survey a line 100 miles straight north and then east to the Des Moines River (the Sac and Fox owned the land east of the river).Sullivan’s line going north (the Indian Boundary Line (1816)) was to ultimately form the longitudal line from Iowa to Texas west of which Native Americans were to be removed in the Indian Removal Act of 1830.The beginning point, also known as "the old northwest corner of Missouri" at the western end of the Sullivan Line is north of Sheridan, Missouri, at north latitude 40.5710859 Despite his intention to draw the border straight east, he drifted north to about 40.6135698 at the boundary's eastern terminus just south of what is now Farmington, Iowa.