WORLD WAR FOUR
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World War III, also known as the Third World War, is a hypothetical future global conflict subsequent to World War I (1914–1918) and World War II (1939–1945). It is widely predicted that such a war would involve all of the great powers, like its two predecessors, and the potential use of nuclear weapons or other weapons of mass destruction, thereby surpassing all prior conflicts in scale, devastation, and loss of life.
World War III was initially synonymous with the escalation of the Cold War (1947–1991) into direct conflict between the US-led Western Bloc and Soviet-led Eastern Bloc. Since the Manhattan Project's development of nuclear weapons in 1945 and their use by the United States in the atomic bombings of Hiroshima and Nagasaki at the end of World War II, the risk of a nuclear apocalypse causing widespread destruction and the potential collapse of modern civilization or human extinction has been central in speculation and fiction about World War III. The Soviet Union's development of nuclear weapons in 1949 spurred the nuclear arms race and was followed by several other countries.
Regional proxy wars including the Korean War (1950–1953), Vietnam War (1955–1975), and Soviet–Afghan War (1979–1989), while significant, did not lead to a full-scale global conflict. A global conflict was anticipated and planned for by military and civil personnel around the world, with scenarios ranging from conventional warfare to limited or total nuclear warfare. The certainty of escalation from one stage to the next was extensively debated. For example, the Eisenhower administration promulgated a policy of massive retaliation with nuclear forces, to a minor conventional attack. After events such as the Cuban Missile Crisis in 1962, which brought the U.S. and Soviet Union to the brink of war, the strategic doctrine of mutually assured destruction, which held that a full-scale nuclear war would annihilate all parties to the conflict, became widely accepted. Advocates of deterrence theory hold that nuclear weapons prevent World War III–like great power conflict, while advocates of nuclear disarmament hold that their risks far outweigh this.
Since the end of the Cold War in 1991, speculation about World War III shifted toward emerging threats, including terrorism and cyberwarfare. Great-power competition was renewed between the United States, China, and Russia, sometimes termed a Second Cold War. Various conflicts, most significantly the Russian invasion of Ukraine ongoing since 2022, as well as rising tensions over the status of Taiwan, have been perceived as potential flashpoints or triggers for a third world war.
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