Hungarian Revolution of 1956

Iron Curtain: A term used by Winston Churchill in his speech in Fulton, Missouri on March 5, 1946 when he said "From Stettin in the Baltic to Trieste in the Adriatic an iron curtain has descended across the Continent." It refers metaphorically to the ideological barrier erected by Stalin between Eastern Europe under communist control and Western democracies.

Cold War: A period of geopolitical tension between two superpowers, United States and Soviet Union after World War II. It lasted from approximately 1947-1991 characterized by political hostility, military tension but no large-scale fighting directly between them.

Soviet Bloc: Refers to a group of socialist states under influence or direct administration of Soviet Union during Cold War period which were part of Eastern Bloc with Warsaw Pact serving as defense treaty among them.