Got everything... including the USSR by typing in "Russia." Pretty generous time limit, I was guessing a lot of random stuff before I happened upon Liechtenstein.
It is a difficult subject, italy after 1943 was completely occupied. In the north, the Republic of Salò was a puppet state of the Nazis and in the south, the Allied cobelligerent Kingdom of the South. The continuity of the Italian State is not very clear in those periods.
Pretty good quiz, but there were a few mistakes. USSR does not work for the Soviet Union, and you missed some wars. I will make sure to nominate once these mistakes are fixed.