17th-18th centuries | 19th century | 20th century | 21st century

The 20th Century (XX Century) lasted from 1901 to 2000. The following are events that happened in the 20th century:

  • 1995: The Chicago Heat Wave of 1995.
  • 1992: April 13, the Chicago Flood.
  • 1983: Harold Washington became the first African-American Mayor.
  • 1979: May 25, the American Airlines Flight 191 crashes.
  • 1979: Chicago's first female mayor, Jane M. Byrne, takes office.
  • 1978: Heavy snowstorm and city's perceived slow response lead to upset of incumbent mayor.
  • 1978: First Bulletin board system goes online on February 16.
  • 1973: Sears Tower, the tallest building in the world for next 30 years, was completed.
  • 1969: The Chicago 8 trial opens.
  • 1969: The 100-floor John Hancock Center was built.
  • 1968: August 26-August 29, 1968 Democratic National Convention.
  • 1967: January 26-January 27, Major snowstorm deposits 23 inches of snow, closing the city for several days. [1]
  • 1960: The 1st of the Playboy Clubs, featuring bunnies, opened in Chicago.
  • 1958: Our Lady of the Angels School Fire.
  • 1958: The last streetcar ran in the city. At one time, Chicago had the largest streetcar system in the world.
  • 1955: The first McDonald's franchise restaurant, owned by Ray Kroc, opened in the suburb of Des Plaines, Illinois.
  • 1935: January 19, Coopers Inc. sells the world's first briefs.
  • 1934: John Dillinger was shot by the FBI in the alley next to the Biograph Theater.
  • 1933: Mayor Anton Cermak was killed while riding in a car with President-elect Roosevelt. The assassin was thought to have been aiming for Roosevelt.
  • 1933: Century of Progress World's Fair.
  • 1930: Shedd Aquarium opens.
  • 1930: Adler Planetarium opened, through a gift from local merchant Max Adler. It was the first planetarium in the Western Hemisphere.
  • 1930: The Merchandise Mart was built for Marshall Field & Co. The $32 million, 4.2 million square foot (390,000 m²) building was the world's largest commercial building. It was sold it to Joseph P. Kennedy in 1945.
  • 1929: February 14, the St. Valentine's Day Massacre.
  • 1927: Originally called the Chicago Municipal Airport, Midway Airport opened. It was renamed in 1949 to honor the Battle of Midway in World War II. Midway was the world's busiest airport until 1959.
  • 1925: The Tribune Tower was completed on Michigan Avenue. The building's large Gothic entrance contains pieces of stone from other famous buildings: Westminster Abbey, Cologne Cathedral, the Alamo Mission in San Antonio, the Taj Mahal, the Great Pyramid, and the Arc de Triomphe.
  • 1919: July 27, the Chicago Race Riot of 1919.
  • 1919: Real estate broker Archibald Teller opened the first [[Fannie May]\ candy store.
  • 1915: July 24, the Eastland Disaster.
  • 1913: Great Lakes Storm of 1913
  • 1905: The Industrial Workers of the World was founded in June
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