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An economic and monetary union is a type of trade bloc which is composed of an economic union (common market and customs union) with a monetary union. It is to be distinguished from a mere monetary union (e.g. the Latin Monetary Union in the 19th century), which does not involve a common market. This is the fifth stage of economic integration. EMU is established through a currency-related trade pact. (Wikipedia)

A single market is a type of trade bloc in which most trade barriers have been removed (for goods) with some common policies on product regulation, and freedom of movement of the factors of production (capital and labour) and of enterprise and services. (Wikipedia)

A customs union is a type of trade bloc which is composed of a free trade area with a common external tariff. The participant countries set up common external trade policy, but in some cases they use different import quotas. (Wikipedia)

The Cold War was a state of political and military tension after World War II between powers in the Western Bloc (the United States, its NATO allies and others) and powers in the Eastern Bloc (the Soviet Union and its allies in the Warsaw Pact). (Wikipedia)