"A world war is "a war engaged in by all or most of the principal nations of the world". The term is usually reserved to two ...
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major international conflicts that occurred during the 20th century: World War I (1914–1918) and World War II (1939–1945). However, a variety of global conflicts have been subjectively deemed "world wars", such as the Cold War and the War on Terror." - (en.wikipedia.org 10.04.2021)
