04 March - Chicago was officially incorporated as a city in 1837.

 

Chicago was officially incorporated as a city on March 4, 1837. The city's history, however, dates back to the late 18th century when it was originally settled by Jean Baptiste Point du Sable, a Haitian of African and French descent, in the 1780s. Chicago's strategic location at the southwestern tip of Lake Michigan contributed to its growth as a transportation hub.

In the 19th century, Chicago saw significant development and became a major center for trade and commerce, especially after the completion of the Illinois and Michigan Canal in 1848 and the arrival of the railroad in the 1850s. The city's rapid industrialization and its role in transportation contributed to its emergence as a major economic and cultural center in the Midwest.