<P> Nonetheless, at the Potsdam Conference, the Allies assigned parts of Poland, Finland, Romania, Germany, and the Balkans to Soviet control or influence . In return, Stalin promised the Western Allies that he would allow those territories the right to national self - determination . Despite Soviet cooperation during the war, these concessions left many in the West uneasy . In particular, Churchill feared that the United States might return to its pre-war isolationism, leaving the exhausted European states unable to resist Soviet demands . (President Franklin D. Roosevelt had announced at Yalta that after the defeat of Germany, U.S. forces would withdraw from Europe within two years .) </P> <Table> <Tr> <Td> </Td> <Td> Wikisource has original text related to this article: Iron Curtain Speech </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Wikisource has original text related to this article: Iron Curtain Speech </Td> </Tr> <P> Winston Churchill's "Sinews of Peace" address of 5 March 1946, at Westminster College, used the term "iron curtain" in the context of Soviet - dominated Eastern Europe: </P>

In the early 1990s why did hungary's relations with romania and czechoslovakia become strained