パリ改造
Haussmann's renovation of Paris and New York's "Greensward Plan" in the 1850s and 1860s turned new attention to the role that parks can play in urban development. William Butler Ogden, the first mayor of Chicago, advocated for a state bill to create a large park on the South Side. Although initially rejected when proposed in 1868, the Illinois legislature accepted this plan in 1869. The objective was to create a system of parks and boulevards that would form a circle around Chicago.