20th century 1 21st century 1 English European history 1 History of engineering & technology 1 History of ideas 1 History of science 1 United Kingdom, Great Britain 1 c 1700 to c 1800 1 c 1800 to c 1900 1 c 1900 - c 1914 1 c 1914 to c 1918 (including WW1) 1 c 1918 to c 1939 (Inter-war period) 1 c 1939 to c 1945 (including WW2) 1 c 1945 to c 1960 1 c 1945 to c 2000 (Post-war period) 1 c 1960 to c 1970 1 c 1970 to c 1980 1 c 1980 to c 1990 1 c 1990 to c 2000 1