I wondered, on what did you base your list? Population, GDP, military expenditures, etc? Or did you just figure these would be the ones?
I came up with a set of 10 that includes pretty much the entire world:
1. Great-China: China, Taiwan, Philipines, part of Indochina
2. Great-India: India, Nepal, Burma, part of Indochina
3. Coalition of the Willing: United States, Great-Britain, Australia, Pakistan, Turkey, Saudi-Arabia, Israël, Poland, etc.
4. Islamitic Union: Indonesia, Iran, Iraq, Syria, North-Africa (Islamitic part), etc.
5. Great-Japan: Japan & Korea [North-Korea has been conquered and reunited with the South]
6. Pan-Russian Union: The former Soviet Union, Serbia, Rumenia, Moldavia
7. South-American Populist Union: Venezuela, Bolivia, Cuba, Mexico
8. South-American Free Trade Union: Brazil, Argentina, Chile, Colombia, etc.
9. European Union: Germany, France, Italy, Spain, Portugal, Switzerland, Chech Republic, Austria, Malta, Greece, Great-Netherlands (Netherlands, Belgium, Luxemburg), Scandinavian Federation (Iceland, Norway, Sweden, Finland, Denmark), Hungary, Bulgaria, Slovenia, Croatia, Bosnia, Macedonia
10. Sub-Saharan Union: Congo, South-Africa, rest of Southern Africa (Christian part)