| Explanation | Country | % Correct |
|---|---|---|
| United States | United States | 99%
|
| Protectorate in 1898–1902; occupied during the 20th century | Cuba | 98%
|
| Occupied during WWII | Denmark | 98%
|
| Post-WWII occupation | Japan | 98%
|
| Invaded during the War in Afghanistan | Afghanistan | 97%
|
| Disputed Oregon Country; parts of Louisiana territory, 1803–1818 | Canada | 97%
|
| Post-WWI and WWII occupation zones | Germany | 97%
|
| Occupied during the 20th century | Haiti | 97%
|
| Occupied during WWII | Iceland | 97%
|
| Panama Canal Zone; occupied during the 20th century | Panama | 97%
|
| US military government in the Korean peninsula post-WWII | South Korea | 97%
|
| Occupied during the 20th century | Dominican Republic | 96%
|
| Invaded during the Iraq War | Iraq | 96%
|
| Territory in 1898–1946 | Philippines | 96%
|
| Occupied during the 20th century | Honduras | 94%
|
| Occupation of Veracruz, 1914; minor land exchanges along the Rio Grande | Mexico | 94%
|
| Occupied during the 20th century | Nicaragua | 94%
|
| Occupied during WWII | Suriname | 94%
|
| Post-WWII occupation zone | Austria | 92%
|
| Post-WWI East Adriatic occupation zone | Croatia | 88%
|
| Trust Territory of the Pacific Islands, 1947–1994 | F.S. Micronesia | 87%
|
| Concessions in Tianjin and Shanghai | China | 86%
|
| Free Territory of Trieste, 1947–1954 | Italy | 86%
|
| Occupation of Nassau, 1783 | Bahamas | 85%
|
| Trust Territory of the Pacific Islands, 1947–1994 | Marshall Islands | 85%
|
| Trust Territory of the Pacific Islands, 1947–1994 | Palau | 84%
|
| Held by the US in 1831–1832 | United Kingdom | 84%
|
| Occupied during WWII | France | 81%
|
| American Trading Company of Borneo, 1865–1866 | Malaysia | 78%
|
| Invaded in 1984 | Grenada | 77%
|
| Christmas Island until 1983; Canton and Enderbury Islands, 1939–1979 | Kiribati | 76%
|
| Occupied during WWII | Netherlands | 73%
|
| State-sponsored colonies during the 19th century | Liberia | 56%
|
| US military government in the Korean peninsula post-WWII (part of North Korea below the 38th parallel) | North Korea | 42%
|