After WWII, what country lost much of its eastern territory to Russia, but did pick up much of Pomerania, Silesia and East Prussia?

Question : After WWII, what country lost much of its eastern territory to Russia, but did pick up much of Pomerania, Silesia and East Prussia?

Answer : The country lost much of its eastern territory to Russia, but did pick up much of Pomerania, Silesia and East Prussia was Poland.

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