Thompson's plat fixed the location associated with the word "Chicago", which had previously been used for various places around the southwestern shore of Lake Michigan, and allowed the residents of the area to obtain legal title to their property. Extensions of Thompson's plat were made in the following years as Chicago experienced rapid expansion. Chicago incorporated as a town in 1833 and as a city in 1837 as growth continued, and by 1890 had more than a million inhabitants and was the second-most-populous city in the United States.