Walgreens began in 1901, with a small food front store on the corner of Bowen and Cottage Grove Avenues in Chicago, owned by Galesburg native Charles R. Walgreen By 1913, Walgreens had grown to four stores on Chicago’s South Side.It opened its fifth in 1915, and four more in 1916.
: https://en.m.wikipedia.org/wiki/Walgreens