Carlomaria Grassi ||| Curious City: How Chicago became the country's alley capital | WBEZ 91.5 Chicago

This expanding grid eventually hit the Chicago
area.    According to cartographer and
Chicago history buff Dennis McClendon, alleys had become so commonplace in the
American West that the Illinois General Assembly “simply expected it to happen
in Chicago” ...     Curious City: How Chicago became the country's alley capital | WBEZ 91.5 Chicago