After World War II, the Allied powers ceded the German lands east of the Order and Lusatian Neisse rivers to Poland — creating a border dispute that would last all through the Cold War.
It were the Soviets who insisted on the change. Joseph Stalin wanted to annex the Eastern Borderlands of the former Polish Republic — which were only lightly populated by ethnic Poles — to Russia proper while still putting a strong Polish buffer state in between it and Germany. Hence the need to add Germany's eastern provinces to the new Poland.
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