History World War, 1914-1918 Campaigns 105 World War, 1939-1945 103 Social aspects 98 Politics and government 97 Social conditions 83 more ... Influence 74 Foreign relations 60 Causes 59 Women 52 Soldiers 44 History, Military 37 History and criticism 36 War and society 33 Medical care 29 Nationalism 29 Peace 28 Political aspects 28 Literature and the war 26 Regimental histories 26 Diplomatic history 25 Veterans 23 African Americans 22 Historiography 20 Intellectual life 20 Territorial questions 20 Aerial operations 19 Participation, African American 18 Collective memory 17 less ...