| Years | Country | % Correct |
|---|---|---|
| 1776-1902 1945-1955 | United Kingdom | 100%
|
| 1867- | Canada | 99%
|
| 1801-1803 1849-18631945-1955 | France | 99%
|
| 1821- | Mexico | 99%
|
| 1783-1822 | Spain | 97%
|
| 1836-1845 | Texas | 81%
|
| 1900-1902 | Russia | 75%
|
| 1777-1791 | Vermont | 72%
|
| 1899-1902 | Germany | 70%
|
| 1945-1955 | Soviet Union | 69%
|
| 1848-1863 | China | 63%
|
| 1945-1955 | Italy | 60%
|
| 1945-1949 | Czechoslovakia | 48%
|
| 1903-1999 | Panama | 46%
|
| 1834-1847 | Republic of Maryland | 4%
|