Soviet Union + Japan

The Soviet Union, one of the 3 main countries that joined the war including Britain and France, suffered great losses in the year and a half they were in the war. They lost millions of soldiers and civilians that were necessary to even be in the war, so they dropped out. The country couldn't take the constant grinding of soldiers and supplies. Then came the overthrowing of the Czan during the Russian Rev. Around 1920, the communist party was established which lead to the Soviet Union. During the depression, Russia was not affected because of the foreign trade policies Lenin and Stallin instilled in the Russian gov't.

Japan during WWI didn't really make in impact. They were part of the alliance and were given orders by the British to take out ships near eastern Asia. They then were given part of China through the 21 demands later. During the depression, they were one of the countries that were not affected because of their Finance minister and his crafty ways of cushioning the blow from the depression.