20th century

Wars and politics

Russo-Japanese War

1904 - 1905

First World War

1914 - 1918

Russian Civil War

1917 - 1922

Nazism

1933 - 1945

Spanish Civil War

1936 - 1939

Second Sino-Japanese War

1937 - 1945

Second World War

1939 - 1945

Cold War

1947 - 1991

Korean War

1950 - 1953

Vietnam War

1955 - 1975

Iran-Iraq War

1980 - 1988

Gulf War

1990 - 1991

Culture and entertainment

Mathematics

Physics

Astronomy

Biology

Engineering and technology

Medicine

Energy and the environment