World War, 1914-1918 101 History 32 Economic aspects 8 Politics and government 8 Campaigns 6 History and criticism 6 Influence 5 Máis ... Literature and the war 5 Social life and customs 5 World War, 1939-1945 5 Economic conditions 4 History, Military 4 Military policy 4 Military relations 4 Psychological aspects 4 Foreign relations 3 French literature 3 Music and the war 3 Peace 3 Public opinion 3 Relations 3 Social conditions 3 Soldiers 3 Aerial operations 2 Conscript labor 2 Criticism and interpretation 2 Foreign workers, Chinese 2 Historiography 2 Intellectual life 2 Intellectuals 2 menos ...