Countries that were seized by, or at war with, Axis Powers before World War II
Source: "World War 2 Countries." World War 2. World-War-2.info, 2011. Web. 20 Apr 2011. <http://www.world-war-2.info/countries/>
Countries that were attacked, occupied, or switched sides during the war (many declared neutrality before being assaulted).
Source: "World War 2 Countries." World War 2. World-War-2.info, 2011. Web. 20 Apr 2011. <http://www.world-war-2.info/countries/>
Allied and Axis Powers 1939-1945
Examples of a few keywords combined and used to find this informations:
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Allied Powers
Supporters of the Allies
Source: "World War 2 Countries." World War 2. World-War-2.info, 2011. Web. 20 Apr 2011. <http://www.world-war-2.info/countries/>
Countries that remained neutral
Source: "World War 2 Countries." World War 2. World-War-2.info, 2011. Web. 20 Apr 2011. <http://www.world-war-2.info/countries/>