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This category lists historical sites devoted to the twentieth century time period.
Please list historical sites devoted to the twentieth century time period dating from 1900 to 1999.

Century dates may overlap according to content of the site. (An example: 1895 - 1960 or 1940 - 2002)

This category lists historical sites devoted to the decade of the 1920's time period.
Please list historical sites devoted to the decade of the 1920''s time period.

Decade dates may overlap according to content of the site. (An example: 1919 - 1922 or 1928 - 1930)

This category lists historical sites devoted to the decade of the 1950's time period.
Please list historical sites devoted to the decade of the 1950''s time period.

Decade dates may overlap according to content of the site. (An example: 1949 - 1952 or 1958 - 1960)

History of the 1960s; USA and elsewhere.
This category is for sites dealing with the history of 1960s in the USA and elsewhere. Sites must have substantial (and accurate) historical information. Sites that are primarily pop culture, music, art, etc. should be placed elsewhere.
This category lists historical sites devoted to the decade of the 1970's time period.
Please list historical sites devoted to the decade of the 1970''s time period.

Decade dates may overlap according to content of the site. (An example: 1969 - 1972 or 1978 - 1980)

This category lists historical sites devoted to the decade of the 1980's time period.
Please list historical sites devoted to the decade of the 1980''s time period.

Decade dates may overlap according to content of the site. (An example: 1979 - 1982 or 1988 - 1990)

This category lists historical sites devoted to the decade of the 1990's time period.
Please list historical sites devoted to the decade of the 1990''s time period.

Decade dates may overlap according to content of the site. (An example: 1989 - 1992 or 1998 - 2000)

Sites discussing the influence of the development of nuclear energy on popular culture, history, and society including those that discuss the history of the development of nuclear energy either for military or power production purposes.
Please submit only sites that meet the criteria outlined in the category description, i.e. sites discussing the influence of the development of nuclear energy on popular culture, history, and society including those that discuss the history of the development of nuclear energy either for military or power production purposes.
This category lists sites concerning the 20th century Cold War.
Please list sites concerning the 20th century Cold War dating from c.1947 to 1991.
This category lists sites of cultural events in the 20th century.
Please list sites of cultural events in the 20th century.
This category lists sites of disasters in the 20th century.
Please list sites of disasters in the 20th century.
This category lists websites about cases of genocide, or those that make claims that incidents were genocide.
Please list sites of genocide in the 20th century.
America's Great Depression (1929-41) was a pivotal era in this country's history.
The history of the Holocaust: the systematic attempted destruction of the European Jews by Nazi Germany during the Second World War. Over ten million innocents, including about six million Jews, perished at the hands of the Nazis.
Please only submit sites which concern concentration or extermination camps that were set up by the Nazis during the rule of Adolf Hitler over Germany. Please send sites about the Auschwitz camps to Regional/Europe/Poland/Voivodships/Malopolska/Oswiecim/Auschwitz-Birkenau.
Category dedicated to the study of the people who shaped the twentieth century. Military leaders go to the Wars and conflicts category.
This category lists historical sites, both political and military, devoted to wars and conflicts within the 20th century time period.
Please list historical sites, both political and military, devoted to wars and conflicts within the 20th century time period dating from 1900 to 1999.

Century dates may overlap according to content of the site. (An example: 1895 - 1960 or 1940 - 2006)