World War, 1914-1918 History 884 Campaigns 303 Politics and government 263 Causes 215 Foreign relations 205 Economic aspects 171 more ... World War, 1939-1945 165 Influence 154 Social aspects 125 Peace 124 Diplomatic history 113 Literature and the war 111 Social conditions 109 Soldiers 108 History and criticism 106 Medical care 76 Women 74 Economic conditions 70 Territorial questions 63 Regimental histories 61 Finance 56 History, Military 56 World politics 52 Reparations 50 Naval operations 48 Aerial operations 45 Veterans 43 Historiography 40 Neutrality 38 less ...