The Iron Curtain was the name of the border between Western Europe and the communist countries of Eastern Europe.The usa hated the communist system.Germany was split into two, the urss controlled east germany while usa britain and france west germany.

korea was part of japan  when the allies defeated japan in 1945 us and soviet forces occupied korea.With the support of the UN , president truman ordered US troops , under the command of general MacArthur, into korea to attempt to drive the north koreans back . Both Communist China and USSR gave massive support to the north koreans. But American troops fought under the flag of the U N, and technically the war was described as a police action of the unitted nations. The US provided 48% of the troops, 43% were south koreans, and the remaining 9% came from a total of seventeen other nations, including Britain and Australia.

Britain, France and the United States ran their zones along capitalist lines. So they did what they could to encourage German business to grow. These changes quickly strengthened the economy in the western zones and in the western sectors of Berlin. This alarmed Stalin, if western Germany became rich and strong he thought, it might once again be able to threaten the Soviet Union. 

  The Berlin Blockade and Airlift 

Stalin decided to force the western allies to leave Berlin. In June 1948 Soviet forces closed all railways, roads and canals leaving leading from their zones into the western sectors of the city. This immediately cut off all food and fuel supplies. So they gathered together a huge fleet of aircraft to take food, coal and clothing to Berlin along three air corridors.