Intergovernmental organizations (IGOs)
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Governments were either free governments or communist government, with some exceptions of dictator governments such as Franco's Spain or Tito in Europe.
The Cold War developed from the conflict between the US and the USSR, which sought to become the dominant world power. The US opposed all communist governments, while the USSR supported many, and established puppet regimes in Eastern Europe.
WWII was the beginning of the cold war where the United States and the USSR fought over being the world super power, and therefore both of them were trying to spread their ideology to the rest of the world. Communist governments were established after WWII because the Soviet Union reinforced them.
The cold war was NOT declared. The cold war was not a war. The cold war was simply a name given to "a non-shooting" military stand off between the communist world and the free world.