World War, 1914-1918 History 903 Politics and government 278 Campaigns 266 Foreign relations 188 World War, 1939-1945 181 Causes 176 more ... Literature and the war 153 History and criticism 146 International relations 145 Social aspects 143 Influence 142 Economic aspects 141 Social conditions 120 Peace 103 Diplomatic history 92 Women 88 Soldiers 86 Territorial questions 84 Military campaigns 83 War 79 History, Military 67 Regimental histories 58 Economic conditions 57 Medical care 55 Finance 51 Veterans 50 Psychological aspects 42 War and society 42 Armed Forces 40 less ...