Warsaw Pact Starts
The Warsaw Pact is commonly known as the treaty between Albania, Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, Romania, and the Soviet Union. It was signed in 1955 in Poland.
This is known to be the Soviet's version of the United States's NATO. This was designed to protect the countries involved from the Allies.
Above is a common poster that would be seen in the USSR trying to make communism sound appealing to everyone around.
The orange color on the map represents the Warsaw Pact Members.