オーデル・ナイセ線
The East German Socialist Unity Party (SED), founded 1946, originally rejected the Oder–Neisse line. Under Soviet occupation and heavy pressure by Moscow, the official phrase "Friedensgrenze" (border of peace) was promulgated in March–April 1947 at the Moscow Foreign Ministers Conference. The German Democratic Republic and Poland's Communist government signed the Treaty of Zgorzelec in 1950 recognizing the Oder–Neisse line, officially designated by the Communists as the "Border of Peace and Friendship".