The Domino Effect: When one nation Falls they all fall. This is important because it shows how it was the first time the U.N was tested in strength. Iron Curtain: Stalin controlled the Communists and kept them under an “Iron Curtain”. This was important because sit was showing The Communists control and how it can’t keep away the U.N.Berlin Wall: A wall built over night dividing Berlin into two and so people dug tunnels to get by. This was important because It showed how the U.S.S.R deceived its inhabitants by “protecting them from the people on the other side” Korean War/General MacArthur: General MacArthur was sent to Korea to send north Koreans back but the went too far. This was important because it showed how the U.N almost fell to the Domino Effect but Macarthur sent them way back. Berlin Airlift: When the U.S and U.K sent supplies over the communist blockade to supply Berlin with supplies. This was important because it showed how the U.S and the U.K helped out with out attacking the Berlin blockade.