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Notice how its boundaries of O'Hare International Airport in the upper left of the map aren't bordered? That's because O'Hare wasn't annexed into Chicago's city limits until 1956. And the use of the term "black" to describe African-American settlements wasn't common in 1950—the standard nomenclature at that time was "negro."
This map was printed by the City of Chicago Department of Development and Planning to highlight Chicago's place in American history during the nation's bicentennial celebrations of the American Revolution. So Mayor Daley ordered the map reprinted to show Chicago's growth into a "world-class city."
Compiled by Neil Gale, Ph.D.