1911 Encyclopædia Britannica, Volume 14… (1911)
“ The earliest American settlers came from the Southern States and naturally introduced the county system; but the increase of population from the New England and Middle States led to a recognition of township organization in the constitution of 1848, and this form of government, at first prevalent only in the northern counties, is now found in most of the middle and southern counties. Cook county, although it has a township system, is governed, like those counties in which townships are not found, by a Board of Commissioners, elected by the townships and the city of Chicago. ”
