Answer:
During World War II, Eastern Europe was caught between Nazi Germany and the Soviet Union. Several Eastern European countries--Hungary, Romania, and Bulgaria--aligned themselves with the Nazis. Nazi troops overran most of the rest of Eastern Europe in the first years of the war. (Troops of Fascist Italy took over Albania.) Some Eastern Europeans joined resistance groups to fight the Nazis. The strongest forces emerged in Yugoslavia and Albania, led by communists. By the war's end in 1945, the Soviet Union's Red Army occupied all of Eastern Europe (except Yugoslavia and Albania).
Shortly before Germany surrendered, U.S. President Franklin D. Roosevelt, British Prime Minister Winston Churchill, and Soviet communist dictator Joseph Stalin met at Yalta, a resort in the Soviet Union. The Allied leaders discussed terms for the German surrender and the future of Eastern Europe.
At Yalta, Stalin assured the other Allies that he would allow the people in the Soviet-occupied countries to hold free elections and choose democratic governments. With the Red Army in Eastern Europe, Churchill and Roosevelt had little choice except to take Stalin at his word. Within three years, however, well-organized and disciplined national communist parties, aided by Stalin, had taken control of Eastern Europe.
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