The Cold War was a sustained state of political and military tension between powers in the Western Bloc, and powers in the Eastern Bloc,. Historians have not fully agreed on the dates, but 1947–1991 is common. It was "cold" because there was no large-scale fighting directly between the two sides, although there were major regional wars in Korea and Vietnam. The Cold War split the temporary wartime alliance against Nazi Germany, leaving the USSR and the US as two superpowers with profound economic and political differences: the former being a single-party Marxist–Leninist state, and the latter being a capitalist state with generally free elections. A self-proclaimed neutral bloc arose with the Non-Aligned Movement founded by Egypt, India, Indonesia and Yugoslavia; this faction rejected association with either the US-led West or the Soviet-led East. The two superpowers never engaged directly in full-scale armed combat but they each armed heavily in preparation of a possible all-out nuclear world war. Each side had a nuclear deterrent that deterred an attack by the other side, on the basis that such an attack would lead to total destruction of the attacker: the doctrine of mutually assured destruction or MAD. Aside from the development of the two sides' nuclear arsenals, and deployment of conventional military forces, the struggle for dominance was expressed via proxy wars around the globe, psychological warfare, propaganda and espionage, and technological competitions such as the Space Race.
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X= The decade the Berlin Wall fell