| 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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| 1816 | |
The previous year, Mt. Tambora erupted producing so much ash and gas the sunlight was blocked from warming the earth causing the "Year Without Summer".USGS |
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| 1818 | |
| 1846 | | 4 Feb:
Brigham Young and 3000 Mormons leave Nauvoo, Illinois on the first leg of their journey, heading for Utah.PBS NPS |
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| 1847 | | 5 Apr:
Brigham Young leads the first Mormon wagon train bound for Utah on the final leg of their journey.Utah NPS |
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| 1858 | | 16 Jun:
Abraham Lincoln kicks off his bid for the U. S. Senate with what will come to be known as the "House Divided" speech.PBS NPS |
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| 1871 | |
| 1872 | | Dec:
The first Rand McNally map is published.NA.gov |
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| 1876 | | 2 Feb:
The National League of Professional Baseball Clubs, which comes to be more commonly known as the National League is formed.Reds SABR |
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| 1895 | | 28 Nov:
The first American automobile race takes place in Chicago.LoC THF |
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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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| 1921 | | 26 Apr:
The first U. S. weather report to be broadcast on the radio is made from station WEW in St. Louis, Missouri.Current MBA |
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| 1930 | | 6 Apr:
The Twinkie is invented.NPR Trib |
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| | 12 May:
The first planetarium in the U. S., the Adler Planetarium, opens to the public.Adler CCT |
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| 1950 | | 24 Sep:
Black Sunday occurs when smoke from forest fires in western Canada makes its way east, darkening the skies in the eastern United States and Canada and as far away as western Europe.BLM WR |
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| 1951 | | 20 Dec:
A nuclear reactor produces useful electricity for the first time. DoE APS |
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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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| 1986 | |
Illinois
