| States in the Merger | Year(s) of Merger | Final Merger State | % Correct |
|---|---|---|---|
| North Germany, Bavaria, Württemberg, Baden, Hesse, Alsace-Lorraine | 1871 | Germany | 89%
|
| West Germany, East Germany | 1990 | Germany | 89%
|
| England, Scotland | 1707 | Great Britain | 89%
|
| Great Britain, Ireland | 1800 | Great Britain and Ireland | 89%
|
| Tanganyika, Zanzibar | 1964 | Tanzania | 89%
|
| Abu Dhabi, Dubai, Sharjah, Ajman, Umm Al Quwain, Fujairah, Ras Al Khaimah | 1971–1972 | United Arab Emirates | 89%
|
| Connecticut, Delaware, Georgia, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, Virginia | 1775–1788 | United States | 89%
|
| North Vietnam, South Vietnam | 1976 | Vietnam | 89%
|
| North Yemen, South Yemen | 1990 | Yemen | 89%
|
| New South Wales, Queensland, South Australia,Tasmania, Victoria, Western Australia | 1901 | Australia | 78%
|
| Austria, Hungary | 1867 | Austria-Hungary | 78%
|
| Serbia, Montenegro | 1992 | FR Yugoslavia | 78%
|
| Egypt, Syria | 1958 | United Arab Republic | 78%
|
| Byelorussia (Belarus), Russia,Transcaucasian, Ukraine | 1922 | USSR | 78%
|
| Serbia, Montenegro,State of Slovenes, Croats and Serbs | 1918 | Yugoslavia | 78%
|
| El Salvador, Honduras, Nicaragua, Guatemala, Los Altos, Costa Rica | 1823–1841 | Central America | 67%
|
| El Salvador, Honduras,Nicaragua | 1852 | Central America | 67%
|
| El Salvador, Honduras, Nicaragua | 1895–1898 | Central America | 67%
|
| South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, North Carolina, Tennessee | 1861–1865 | Confederate States | 67%
|
| Castile, Aragon, Portugal | 1580–1640 | Iberia | 67%
|
| Cape, Natal, Orange, Transvaal | 1909 | South Africa | 67%
|
| New Granada, Venezuela, Quito | 1819–1830 | Gran Colombia | 56%
|
| Moldavia, Wallachia | 1859 | Moldavia-Wallachia | 56%
|
| Poland, Lithuania | 1569 | Poland-Lithuania | 56%
|
| Parma, Modena and Reggio, Tuscany, Romagna | 1859 | Central Italy | 44%
|
| Parma, Modena and Reggio, Tuscany, Romagna | 1831 | Italian United Provinces | 44%
|
| Denmark, Norway, Sweden | 1397–1523 | Kalmar | 44%
|
| Prussia, Saxony, Hesse, Mecklenburg-Schwerin, Mecklenburg-Strelitz, Oldenburg, Saxe-Weimar-Eisenach, Anhalt, Brunswick, Saxe-Altenburg, Saxe-Coburg-Gotha, Saxe-Meiningen, plus more | 1866 | North German Confederation | 44%
|
| Senegal, Gambia | 1982–1989 | Senegambia | 44%
|
| Uri, Schwyz, Unterwalden | 1307 | Swiss Confederation | 44%
|
| British Barbados, British Jamaica, British Leeward Islands (except the Virgin Islands), British Trinidad and Tobago, British Windward Islands | 1958 | West Indies | 44%
|
| Jordan, Iraq | 1958 | Arab Federation | 33%
|
| Libya, Egypt, Syria | 1972–1977 | Federation of Arab Republics | 33%
|
| Georgia, Armenia, Azerbaijan | 1918 | Transcaucasia | 33%
|
| United Arab Republic, (North) Yemen | 1958 | United Arab States | 33%
|
| Peru, Bolivia | 1829–1836 | Peru-Bolivia | 22%
|
| Fadhli, Audhali, Beihan, Dhala, Lower Yafa, Upper Aulaqi, Alawi, Aqrabi, Dathina, Haushabi, Lahej, Lower Aulaqi, Maflahi, Shaib, Wahidi | 1962 | Federation of the Emirates of the South | 11%
|
| Nyasaland, Northern Rhodesia, Southern Rhodesia | 1953 | Rhodesia and Nyasaland | 11%
|
| Upper Volta, Niger, Dahomey, Ivory Coast | 1958–1959 | Sahel-Benin | 0%
|
| Ghana, Guinea, Mali | 1958–1963 | Union of African States | 0%
|