Second World War 153 European history 133 History 127 International relations 67 Modern warfare 64 c 1938 to c 1946 (World War Two period) 57 The Holocaust 52 Military history 50 Postwar 20th century history, from c 1945 to c 2000 46 Europe 45 20th century history: c 1900 to c 2000 44 First World War 43 History of medicine 42 History and Archaeology 41 General and world history 39 c 1940 to c 1949 39 Asian history 38 Social & cultural history 38 Politics & government 37 War crimes 34 Social and cultural history 32 Cultural studies 28 Peace studies & conflict resolution 26 Political science & theory 26 History of the Americas 25 20th century, c 1900 to c 1999 24 Cold wars and proxy conflicts 24 The Cold War 23 c 1914 to c 1918 (World War One period) 23 war 22