The 20th century started on 1 January 1901 and ended on 31st of December 2000, according to the Gregorian calendar. Many individuals confuse the 20th century and the so-called nineteen-hundreds (1900s).
However, a number of arguments have been put forward to justify the common usage. One advanced by Stephen Jay Gould is that the first decade consisted of only nine years, thus contradicting the definition of a decade (ten years). Another argument is that the astronomical year numbering system for years does have a year zero, the year generally referred to as 1 BC. In 2000 the International Organization for Standardization clarified ISO 8601 to use the astronomical year numbering system, which could be interpreted as retroactively endorsing all those who had celebrated the new century a few months earlier. Also, decades are almost always considered as starting with the "0" year and named accordingly ("1960s", etc.).
The term is also used to describe various historical periods that overlap with the calendar definition, most notably the Short twentieth century, which describes the 20th Century as spanning from 1914 to 1989 (or sometimes up to and including 1990 or 1991), relegating the pre-World War I 1900s into the 19th Century and putting the post-Soviet 1990s at the beginning of the 21st Century.
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20th Century :: By Time Period
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20th Century Archives - A site dedicated to making available lost and uncirculated articles, stories, and news of the 20th century. Categories include business, celebrities, the future, health, history, humor, music, radio, TV, quotes, and music.
America in the 1930s - Views the period through films, radio programs, literature, journalism, museums, exhibitions, architecture, art and other forms of cultural expression.
Berkeley Campaign Art - Images of political posters reflecting Berkeley's progressive-left community and culture from the 1970s onward.
Meta Description: [ The political posters that made Berkeley elections of the 1970s to the 1990s so special and colorful. Art for the sake of politics. This site is a companion to the political history Berkeley in the 70s: http://berkeleyinthe70s.homestead.com/index.html. ]
California State University - Special Collections Library - Research about world's fairs from 1851-1940. includes photographs, videos and biographies.
Chronology of 1901 - Describes events and people of that year. Categories include art, discoveries, labor, music, politics, and war.
Meta Description: [ Chronology of historical events that took place during 1901 from India and Abroad ]
Decades in 20th Century America - A collection of print and online sources for each decade, maintained by the Alameda County (CA) Library.
Do You Remember the 70's, 80's and 90s - Share your memories of what the 70's, 80's and 90's were really about. Read about what others remember and leave your own memories for others to read.
Meta Description: [ What do you remember about the 70's, 80's and 90's? Share your memories of your favourite 80's TV shows, 80's movies, 80's music and 80's toys and games. ]
Historical Notes - Information on the Indian Refining Company, Havoline Motor Oil, and The Texas Company/Texaco Inc.
History: 1900s - Important events and people of the twentieth century from About.com
Meta Description: [ THE starting place for exploring 20th Century History. ]
Internet History Group - Project aiming to exchange international historical information.
Streamliners: America's Lost Trains - A chronicle of the impact of the streamliner passenger rail system on American culture during the mid-twentieth century.
Meta Description: [ %TAGS ]
Teaching the 20th-Century History of the United States - Provides full-text access to the ERIC Digest of this name which deals with how to teach students about 20th Century American history.
Meta Description: [ Provides full-text access to the ERIC Digest of this name. ]
The Golden Era - American popular culture from the 1930s-1940s. Information and forums covering vintage clothes, cars, music, movies, radio and history.
The History Guide: Lectures on Twentieth Century Europe - Series of full-text university lectures on the history of 20th century Europe, from Nietzsche's pronouncement of Godless man to the fall of Soviet Communism in 1989.
Meta Description: [ This site contains 16 full-text lectures on the history of 20th century Europe, from Nietzsche's pronouncement of Godless man to the fall of Soviet communism in 1989 ]
The Menzies Era - Australian popular culture from 1949 to 1972 including music, movies, books, and sport.
Meta Description: [ European Movies - 1949 to 1972 - The Menzies Era ]
Twentieth Century - Killeen High School's World History course notes, with activities, links and lesson plan.
Meta Description: [ Curriculum for 20th century history. Activities for World War I & II including dropping of the bomb ]
United Nations Organization Milestones - One-page timeline of events from the creation of the UN to today.
Year by Year: 1990-2004 - Highlights the most important events of the century, time line, cultural events, and natural disasters. Includes a history quiz for various decades.
Meta Description: [ Infoplease Year by Year Page ]
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