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He did get his buffer zone, but it fell over the years
The "Big Three" (Stalin, who ran The soviet union, F.D.R, president of the United States, and Churchill, president of England) Met at the Yalta conference briefly before the end of WWII to discuss matters about Germany. They decided at the end of the conference to split Germany up into four parts, American zone, French zone, British zone, and Soviet zone. After Germany was able to stand on its two feet again, they American zone, French, and British zone formed together as Western Germany. Stalin went back on his word and kept his share of Germany and turned that into Eastern Germany, which was communist. Since Berlin was in Stalin's territory, Berlin was to split in half, Western was democratic, and Eastern was communist. With Europe picking sides, half of Europe was communist, and half wasn't. During this, Stalin didn't want East Berlin to get to West Berlin, so he made a wall. To answer your question... The U.S. dissagreed about communism during the cold war.
He wanted to prevent an invasion.
When the Second World War ended, Germany was organized into four occupation zones, each under the control of: United States, Great Britain, France & the Soviet Union. The Americans, British, & French allowed their zones to be a single nation, known as West Germany. Stalin's Soviet Union prevented the unification of Germany by keeping its eastern occupation zone under communist control and separate from West Germany. It's zone became East Germany.
Those are from the Cold War. The US zone was West Germany while the soviet were East Germany.
Germany was divided into 4 different parts after WW2. There was the British Zone, Soviet Zone, French Zone, and American Zone.
It evolved from the Soviet occupation zone in northern Korea, in much the same way that communist East Germany evolved from the Soviet occupation zone in eastern Germany.
Stalin and the USSR were concerned by the May 1946 election of anti-communists in Berlin and the Soviet occupation zone of Germany. In March 1948, the US extended the Marshall Plan to the Allied occupation zones, and the London 6-Power Conference prepared to establish a federal government there. Following the partition of Berlin, the entire Soviet zone was isolated as the communist puppet state called the German Democratic Republic (GDR or "East Germany"), shortly after the Berlin Airlift concluded in 1949.
He wanted to prevent an invasion.
Geographically, Berlin was inside the Soviet Zone.
The buffer zone was created by the Soviet Union between them and Germany because after being attacked and destroyed by Germany twice they were terrified of it happening again so the zone was there to protect them by having Communist countries in the way.
The Stalin Line was the line of fortifications along the western border of the Soviet Union that began in the 1920's. This was to protect the USSR against western aggression, made up of concrete bunkers and gun emplacements.