| States in the Merger | Year(s) of Merger | Final Merger State | % Correct |
|---|---|---|---|
| Serbia, Montenegro, Bosnia and Herzegovina | 1991 | FR Yugoslavia | 65%
|
| Colombia, Ecuador, Panama, Venezuela | 2008 | Gran Colombia | 53%
|
| Poland, Lithuania, Galicia and Lodomeria, Belarus | 1917 | United States of Poland | 41%
|
| Algeria, Libya, Mauritania, French Morocco, Spanish Morocco, Spanish Sahara, Tunisia | 1945-1958 | Maghreb | 35%
|
| Peru, Bolivia | 2011 | Peru-Bolivia | 35%
|
| Fiji, Hawaii, Samoa, Tonga, Tahiti | 1882 | Polynesia | 35%
|
| Russia, Byelorussia (Belarus), Ukraine, Azerbaijan, Kazakhstan, Kirghizia (Kyrgyzstan), Tajikistan, Turkmenia (Turkmenistan), Uzbekistan | 1990–1991 | Union of Soviet Sovereign Republics | 35%
|
| Peru, Bolivia | 1880 | United States of Peru-Bolivia | 35%
|
| Cuba, Puerto Rico, Dominican Republic | 1869–1870 | Antillean Confederation | 29%
|
| Bavaria, Württemberg, Baden, Hesse-Darmstadt | 1866 | South German Confederation | 29%
|
| Yugoslavia, Albania, Bulgaria | 1946–1948 | Balkan Federation | 24%
|
| Serbia, Montenegro, Kosova | 1993–2006 | Balkania | 24%
|
| Yugoslavia, Bulgaria, Albania | 1910–1916 | Balkan Socialist Federation | 24%
|
| Kenya, Tanganyika, Uganda, Zanzibar | 1960–1964 | East African Federation | 24%
|
| Bulgaria, Romania | 1878–1879 | Bulgaria-Romania | 18%
|
| Bulgaria, Romania | 1886–1887 | Bulgaria-Romania | 18%
|
| United Kingdom, Ireland, Canada, Australia, Newfoundland, New Zealand, South Africa, India | 1911–1937 | Imperial Federation | 18%
|
| North Vietnam, South Vietnam, Kampuchea, Laos | 1975 | Indochina | 18%
|
| Belarus, Czechoslovakia, Estonia, Finland, Hungary, Latvia, Lithuania, Poland, Romania, Ukraine, Yugoslavia, Bulgaria | 1918 | Intermarium | 18%
|
| Libya, Tunisia | 1974 | Arab Islamic Republic | 12%
|
| Estonia, Finland | 1881–1941 | Estonia-Finland | 12%
|
| France, United Kingdom | 1904–1956 | Franco-British Union | 12%
|
| Hungary, Romania | 1917–1920 | Hungary-Romania | 12%
|
| Bahamas, Turks and Caicos Islands | 2010 | Lucaya | 12%
|
| Argentina, Bolivia, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, El Salvador, Ecuador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Puerto Rico, Uruguay, Venezuela | 1922 | Patria Grande | 12%
|
| Poland, Czechoslovakia | 1939–1948 | Polish-Czechoslovak Confederation | 12%
|
| Poland-Lithuania, Russia | 1574–1658 | Polish–Lithuanian–Muscovite Commonwealth | 12%
|
| Afghanistan, Pakistan | 1953–1954 | Afghanistan-Pakistan | 6%
|
| Colombia, Peru, Bolivia | 1826 | Andes | 6%
|
| United Kingdom, United States | 1860–1914 | Anglo-American Union | 6%
|
| Denmark, Sweden, Finland, Norway, Iceland, Estonia, Lithuania, Latvia | 1928–1960 | Baltoscandia | 6%
|
| Belgium, Netherlands | 1860 | Belgium–Netherlands | 6%
|
| Hungary, Romania, Vojvodina, Croatia, Slovakia | 1850 | Danubia | 6%
|
| French Togoland, British Togoland | 1945–1956 | Ewe Land | 6%
|
| Jordan, Iraq, Syria, Lebanon,Palestine | 1949–1958 | Fertile Crescent | 6%
|
| France, West Germany | 1950 | Franco-German Federation | 6%
|
| Dutch East Indies, British Malaya, Sarawak, North Borneo, Brunei, Singapore, Portuguese Timor | 1928 | Greater Indonesia | 6%
|
| Greece, Yugoslavia | 1942–1944 | Greek–Yugoslav Confederation | 6%
|
| Guinea-Bissau, Cape Verde | 1975 | Guinea-Cape Verde | 6%
|
| Bhutan, Nagaland, Nepal, North-East Frontier Agency, Sikkim | 1962 | Himalaya | 6%
|
| Ethiopia, Somalia, South Yemen | 1977 | Horn of Africa | 6%
|
| Argentina, Uruguay, Paraguay | 1850 | La Plata | 6%
|
| Malaysia, Indonesia, Philippines | 1963 | Maphilindo | 6%
|
| Dutch New Guinea, Solomon Islands, Papua and New Guinea | 1957 | Melanesia | 6%
|
| Netherlands, Indonesia | 1949–1956 | Netherlands–Indonesia | 6%
|
| Crown Colony of North Borneo, Crown Colony of Sarawak, Brunei | 1956–1960 | North Borneo | 6%
|
| Connecticut, Massachusetts, New York, New Hampshire, New Jersey, Pennsylvania, Rhode Island, Vermont | 1804 | Northern Confederacy | 6%
|
| Donetsk PR, Luhansk PR | 2014 | Novorossiya | 6%
|
| Poland-Lithuania, Cossack Hetmanate | 1658–1659 | Polish–Lithuanian–Ruthenian Commonwealth | 6%
|
| Juliana, Riograndense, Uruguay | 1836 | Rio Uruguay | 6%
|
| Guam, North Mariana Islands | 1969 | Territory of the Marianas | 6%
|
| Transjordan, Palestine | 1945–1972 | United Arab Kingdom | 6%
|
| Cyprus, Northern Cyprus | 2004 | United Cyprus | 6%
|
| Ecuador, Peru, Bolivia | 1846 | United Kingdom of Ecuador, Peru and Bolivia | 6%
|
| Angola, Belgian Congo, Ruanda-Urundi, French Congo, Ubangi-Shari, French Chad, French Cameroon, French Gabon, Spanish Guinea, São Tomé and Príncipe | 1957–1959 | United States of Latin Africa | 6%
|