World War, 1914-1918 History 475 Campaigns 154 Politics and government 117 World War, 1939-1945 94 Foreign relations 78 Literature and the war 70 Causes 69 Influence 64 Social aspects 64 History and criticism 61 Social conditions 58 Peace 50 Soldiers 49 Regimental histories 41 Diplomatic history 40 Women 35 History, Military 26 Naval operations 26 Veterans 26 Aerial operations 24 Medical care 22 World politics 22 African Americans 19 Economic aspects 19 Generals 19 Historiography 18 War and society 18 Territorial questions 17 Intellectual life 16