|For a chronology of the major events leading to the Great War, see Timeline.|
Little is known about the various pre-War countries, aside from countries that have had prominent appearances in the Fallout series such as the United States, and to a smaller extent China, Canada and the Soviet Union. Nonetheless, many nations are mentioned in-game, with most of the information concerning other countries in-game being made prior to the Great War.
- Denmark (Greenland)
- United Kingdom
Other international organizations
- The European Commonwealth (began to dissolve after the Euro-Middle Eastern War).
- The United Nations (disbanded during the Resource Wars).
- The North Atlantic Treaty Organization (unknown fate).
The world map in federal surveillance center K-21B, the Whitespring bunker, and the globe has several notable changes. On them, several bodies of water such as the Mediterranean Sea are the same color as landmasses. Additionally, the Soviet Union, present in the Fallout universe, is split into former-Soviet states such as Ukraine and Russia like in the real world, rather than united as one country. Although this would indicate a strong case of divergence, in reality, the map used in-game is from Wikimedia Commons, representing the real world circa 2004. A developer error occurred while using the Fill tool in a photo-editing program, causing the aforementioned filled-in bodies of water.