Foster was incorporated with Scituate, Rhode Island in 1730, forming the western section of that township, and remained part of Scituate until 1781, when it was split off as a distinct and separate township.
In the 1920s the Ku Klux Klan was active in the area, and one of the largest Klan rallies in the state was held in Foster on the Old Home Day grounds in 1924 with 8,000 in attendance and U.S. Senator J. Thomas Heflin of Alabama speaking [REF].