Example image of eyePlorer eyePlorer map for 'Head of state': Commonwealth Federation Monarchy Republic Sovereign state Constitution Nation state Charles de Gaulle Head of government Parliamentary system Presidential system Semi-presidential system Style (manner of address) Constitution of Sweden Taoiseach Department of the Taoiseach Her Majesty's Government Monarch United Kingdom Cabinet (government) Prime minister Advice (constitutional) Constitutional monarchy Commonwealth realm Edward VIII of the United Kingdom Glorious Revolution Mary II of England Personal union William III of England Spanish Constitution of 1978 Benito Mussolini Italy Victor Emmanuel III of Italy President World War II United States Americas Brazil Colombia Latin American wars of independence Mexico United States Constitution Coup d'état Latin America Middle East Absolute monarchy Communism Single-party state Andrew Johnson De facto