Historians do not fully agree on the dates, but 1947–91 is common. The term "cold" is used because there was no large-scale fighting directly between the two sides, although there were major regional wars, known as proxy wars, supported by the two sides. 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 operating a planned economy and controlled press and owning exclusively the right to establish and govern communities, and the latter being a capitalist state with generally free elections and press, which also granted freedom of expression and freedom of association to its citizens. 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 were heavily armed in preparation for 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 (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, massive propaganda campaigns and espionage, rivalry at sports events, and technological competitions such as the Space Race.