20th century


 * For the real timeline, see at .

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Decades

 * 1900s
 * 1910s
 * 1920s
 * 1930s
 * 1940s
 * 1950s
 * 1960s
 * 1970s
 * 1980s
 * 1990s

Major Events

 * 1919 ― (6 January) Theodore Roosevelt dies.
 * 1947 ― Roswell UFO incident is being caused in New Mexico by time travelling Planet Express crew.
 * 1998 ― USAF Flying Destiny is launched.