| 1674 | | 4 Dec:
Father Jacques Marquette sets up camp on the shores of Lake Michigan at what would later become the city of Chicago, Illinois.EC SNU |
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| 1871 | |
| 1886 | | 4 May:
A peaceful labor demonstration erupts into violence and death at Haymarket Square in Chicago.ILHS PBS |
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| 1895 | | 28 Nov:
The first American automobile race takes place in Chicago.LoC THF |
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| 1896 | | 29 Jan:
Émil H. Grubbe becomes the first to use radiation to treat a patient with recurrent breast cancer.ASCoPost RK |
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| 1902 | | 4 Mar:
The American Automobile Association is established in Chicago.AAA C&R |
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| 1903 | |
| 1913 | | 31 Oct:
The first transcontinental highway, the Lincoln Highway, is dedicated.DOT ILH |
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| 1930 | | 12 May:
The first planetarium in the U. S., the Adler Planetarium, opens to the public.Adler CCT |
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| 1938 | | 24 Feb:
The first nylon-bristled toothbrushes, the first modern toothbrushes, go on sale.W I R E D SM.UK |
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| 1955 | |
| 1967 | | Aug:
Amana introduces the first practical consumer microwave oven.GoogleBooks |
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| 1968 | | 26 Aug:
The Democratic Convention takes place against a backdrop of violence between Vietnam War protesters and Chicago Police.CNN SIMag |
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Chicago, Cook
