You will need
- - pre-war political map of the world;
- the post - war political map of the world.
The Treaty establishing the Union was signed on 30 December 1922. Signed it of the RSFSR, the Ukrainian and Belarusian Soviet socialist Republic and the Transcaucasian Soviet Federative socialist Republic, which included Georgia, Armenia and Azerbaijan. These new Statesappeared on the territory of pre-revolutionary Russia. But some countries, in the course of the great October socialist revolution gained independence, to join did not. It is countries such as Poland, Finland, Latvia, Lithuania and Estonia. Gdansk, previously belonged to Germany, became a free city.
As for Europe, after world war I it split into several countries of the Austro-Hungarian Empire. On its territory there Austria, Hungary, Czechoslovakia and several of the Balkan States, later became part of the Socialist Federal Republic of Yugoslavia.
The formation of new States was and in the far East. In particular, almost simultaneously with the Soviet Union on the world map, a Mongolian people's Republic. As a separate state at that time existed of Tuva and Buryatia, in the 30-ies joined the Soviet Union and entered into the rights of autonomy in the RSFSR.
The division of Europe began shortly before the Second world war. The Baltic countries and Moldova joined the Soviet Union. Changed the territory of Ukraine and Belarus – in their composition entered Western territory, formerly part of Poland. As for the Soviet Union, Union republics in its composition in the last prewar years was sixteen: the RSFSR, the Ukrainian, Belarusian, Latvian, Lithuanian, Estonian, Armenian, Azeri, Georgian, Moldovan, Kazakh, Uzbek, Tajik, Turkmen, Kyrgyz and of the Karelo-Finnish Soviet socialist Republic. In the future of the Karelo-Finnish SSR became part of the Russian Federation on the rights of autonomy.
Major changes after the Second world war happened in Europe. In Germany was formed in fact, three States – Germany, the GDR and West Berlin. The territory of the GDR was controlled by the Soviet Union, West Germany and West Berlin were located in the area of responsibility of the allies, i.e. Britain, France and the United States.
To the socialist countries, except East Germany were Poland, Bulgaria, Hungary, Czechoslovakia, Romania, Yugoslavia. Part of the Socialist Federal Republic of Yugoslavia included Serbia, Croatia, Bosnia and Herzegovina, Slovenia, Montenegro. To 90-th years of the Yugoslavia and Czechoslovakia broke up into separate States.
Different spheres of influence were and in Asian countries. for example, during Soviet times, there was not only the DPRK and South Korea, but North and South Vietnam, which later merged.