Countries

List

 * 1) Austria (Europe)
 * 2) Belgium (Europe)
 * 3) Bulgaria (Europe)
 * 4) Communist Party of China (Asia)
 * 5) Czechoslovakia (Europe)
 * 6) Denmark (Europe)
 * 7) Estonia (Europe)
 * 8) Finland (Europe)
 * 9) France (Asia) (Asia)
 * 10) France (Europe)
 * 11) Germany (Europe)
 * 12) Great Britain (Asia) (Asia)
 * 13) Great Britain (Europe)
 * 14) Greece (Europe)
 * 15) Guangxi (Asia)
 * 16) Hungary (Europe)
 * 17) Ireland (Europe)
 * 18) Italy (Europe)
 * 19) Japan (Asia)
 * 20) Latvia (Europe)
 * 21) Lithuania (Europe)
 * 22) Manchukuo (Asia)
 * 23) Mengjiang (Asia)
 * 24) Mongolia (Asia)
 * 25) Netherlands (Asia) (Asia)
 * 26) Netherlands (Europe)
 * 27) Norway (Europe)
 * 28) Poland (Europe)
 * 29) Portugal (Asia) (Asia)
 * 30) Portugal (Europe)
 * 31) Republic of China (Asia)
 * 32) Romania (Europe)
 * 33) Spain (Europe)
 * 34) Sweden (Europe)
 * 35) Switzerland (Europe)
 * 36) Thailand (Asia)
 * 37) Tibet (Asia)
 * 38) Turkey (Europe)
 * 39) USA (Asia) (Asia)
 * 40) USA (Europe)
 * 41) USSR (Asia) (Asia)
 * 42) USSR (Europe)
 * 43) Xinjiang (Asia)
 * 44) Yugoslavia (Europe)
 * 45) Yunnan (Asia)

Availability
There are 39 playable countries, and here is a 101 on how to unlock them.

Europe
You get 10 countries to start with, and playing certain missions with them will unlock the next one in the tree.

France-->Great Britain

USA-->Turkey-->Germany

USSR-->Sweden

Italy-->Belgium-->Switzerland

Romania-->Poland-->Austria

Hungary-->Bulgaria-->Portugal

Yugoslavia-->Ireland-->Czechoslovakia

Norway-->Greece-->Denmark

Netherlands-->Finland-->Spain

Latvia-->Lithuania-->Estonia

Asia
Whether you bought the expansion pack or unlocked all countries, once you unlocked Asia, all countries are available.

Comintern: USSR (Asia), Mongolia, Communist Party of China

GEACPS (Axis): Japan, Manchukuo, Mengchukuo

Allies + CUF: USA (Asia), Great Britain (Asia), France (Asia), Republic of China, Netherlands (Asia), Portugal, Tibet

Neutral: Guangxi, Yunnan, Sinkiang, Thailand