During the 1820s a Scotsman by the name of Kenneth MacKenzie had immigrated to America, made quite a fortune in the fur trade, and decided to settle down to the life of a farmer. He purchased from Gregoire Sarpy a tract of about , the eastern half of the Sarpy lands, and established a great plantation. MacKenzie's property included all the land between what is now Hazel Avenue to the north, Gravois Road to the south, Laclede Station Road to the west, and River des Peres to the east. This is much of what is Affton today and explains how part of Shrewsbury came to be included in the Affton School District.