Extended information on historical events World Wars
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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 major international conflicts that occurred during the 20th century: World War I (1914–18) and World War II (1939–45). However, a variety of global conflicts have been subjectively deemed "world wars", such as the Cold War and the War on Terror.
The instability created in Europe by the First World War (1914-18) set the stage for another international conflict—World War II—which broke out two decades later and would prove even more devastating. Rising to power in an economically and politically unstable Germany, Adolf Hitler, leader of the Nazi Party, rearmed the nation and signed strategic treaties with Italy and Japan to further his ambitions of world domination. Hitler’s invasion of Poland in September 1939 drove Great Britain and France to declare war on Germany, marking the beginning of World War II.