| Nation | Head of Government |
|---|
| Democratic People's Republic of Korea | |
| Kingdom of Denmark | |
| Burkina Faso | |
| Georgia | |
| Republic of Liberia | |
| Republic of Singapore | |
| Republic of India | |
| Czech Republic | |
| Republic of Uzbekistan | |
| Kingdom of Cambodia | |
| United Kingdom of Great Britain and Northern Ireland | |
| Montenegro | |
| Republic of Cyprus | |
| United Mexican States | |
| Commonwealth of the Bahamas | |
| Republic of the Philippines | |
| Federal Democratic Republic of Ethiopia | |
| Republic of Iraq | |
| Republic of Yemen | |
| Republic of Kenya | |
| Republic of Guatemala | |
| Japan | |
| Republic of Costa Rica | |
| Republic of Turkey | |
| Democratic Republic of Sao Tome and Principe | |
| Democratic Socialist Republic of Sri Lanka | |
| Independent State of Papua New Guinea | |
| Republic of Senegal | |
| Republic of the Congo | |
| Grand Duchy of Luxembourg | |
| Principality of Andorra | |
| Republic of Moldova | |
| Kingdom of Swaziland | |
| Republic of Malta | |
| Republic of Sierra Leone | |
| Federation of Saint Kitts and Nevis | |
| United Republic of Tanzania | |
| New Zealand | |
| Republic of Lithuania | |
| Republic of Seychelles | |
| Kingdom of Saudi Arabia | |
| Republic of Maldives | |
| Republic of Nauru | |
| Republic of Ghana | |
| Republic of Burundi | |
| United Arab Emirates | |
| Hungary | |
| Republic of Trinidad and Tobago | |
| Bolivarian Republic of Venezuela | |
| Republic of the Marshall Islands | |
| Kingdom of the Netherlands | |
| Republic of Mozambique | |
| Saint Lucia | |
| Tuvalu | |
| Republic of Cote d'Ivoire | |
| Federal Republic of Germany | |
| (partially recognized)State of Palestine | |
| Argentine Republic | |
| Islamic Republic of Mauritania | |
| Kingdom of Morocco | |
| United States of America | |
| Dominican Republic | |
| Republic of Kiribati | |
| Republic of Albania | |
| Union of the Comoros | |
| Republic of Zimbabwe | |
Ivy League
Original 13 Colonies
20th Century by Image
