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Because Germany had taken over so much of Europe.
Poland
The map of Europe had changed significantly because many nations' borders had changed.
The map of Europe before World War 1 showed that the largest nation was Austria-Hungary. It was a multinational state composed of Austrians, Czechs, Hungarians, Slovaks, Serbs, Ukrainians, Croats, Romanians, Italians, and Slovenians.
The Iron Curtain separated Europe into the groups. A map or diagram showing the divide of Europe can be found in many history books.