Chicago grew in a way that many American cities have grown: they annexed land and communities just outside their borders. Famously, New York City annexed Brooklyn in 1898 when the separate community across the East River was one of the most populous communities in the United States. But Chicago also had its share of large annexations that helped it add neighborhoods and expand to the borders it has today. The Encyclopedia of Chicago summarizes this process:

For Chicago, the period of extensive annexations extended from 1851 to 1920. The largest annexation occurred in 1889, when four of five incorporated townships surrounding Chicago (as well as a part of the fifth) were annexed to the city. Most annexations to Chicago during these years came because Chicago offered superior services, from better water connections in the nineteenth century to better high schools in the early twentieth. Later, prior incorporations and suburban resistance to the power and urban complexity of Chicago halted the process.
Chicago is often known now as a city of neighborhoods and starting with efforts by University of Chicago sociologists in the 1920s to define Chicago neighborhoods, it has 77 community areas. But many of these areas were once suburban. Historian Elaine Lewinnek in The Working Man’s Reward discusses what happened in Lake Township, bordered by Pershing, State, 87th, and Cicero, as it developed as an industrial suburb with working-class residents. It was added to the city in 1889, an important year for the city’s boundaries as several other large suburban areas were incorporated into the city including Hyde Park just east of Lake Township and Jefferson Township and Lake View Township on the north side of the Loop.
As these suburban areas became part of the city, they received city services and became part of the larger city’s fabric. They added residents and structures. But they also have hints of suburban life. Row upon row of single-family homes. Strip malls and big box stores. Residents might drive more.
Such neighborhoods can be found in many American cities. Big cities are not just the dense downtowns with skyscrapers, major corporate offices, and certain cultural institutions. They include numerous residential, commercial, and industrial neighborhoods on their edges where the borders of municipal boundaries can blur.








