After the Great Chicago Fire of 1871 destroyed a third of the city, including the entire central business district, Chicago experienced rapid rebuilding and growth. During Chicago's rebuilding period, the world's first skyscraper was constructed in 1885 using steel-skeleton construction.

In 1893, Chicago hosted the World's Columbian Exposition on former marshland at the present location of Jackson Park. The Exposition drew 27.5 million visitors, and is considered among the most influential world's fairs in history. The University of Chicago had been founded one year earlier in 1892 on the same location. The term "midway" for a fair or carnival referred originally to the Midway Plaisance, a strip of park land that still runs through the University of Chicago campus and connects Washington and Jackson Parks.

The city was the site of labor conflicts and unrest during this period, which included the Haymarket affair on May 4, 1886. Concern for social problems among Chicago’s lower classes led Jane Addams to be a co-founder of Hull House in 1889, the first of what were called settlement houses. Programs developed there became a model for the new field of social work. The city also invested in many large, well-landscaped municipal parks, which also included public sanitation facilities.

The 1920s brought notoriety to Chicago as gangsters, including the notorious Al Capone, battled each other and law enforcement on the city streets during the Prohibition era. The 1920s also saw a major expansion in industry. The availability of jobs attracted African Americans from the South. They arrived by the tens of thousands in the Great Migration, contributing food, music and soul to a new cosmopolitan culture that made Chicago a center of jazz and blues, and great food. Their work helped build Chicago in numerous ways. 

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Chicago".