World War II

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World War II, also known as the Second World War, was a mid-20th-century conflict that engulfed much of the globe and is generally considered the most costly and intense war in human history.

Related Topics:
War - Human history

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The conflict began by most Western accounts on September 3 1939 due to the German invasion of Poland two days prior, and lasted until summer of 1945, involving many of the world's countries. Virtually all countries that participated in World War I were involved in World War II. Many consider World War II to be the only true world war due to the overwhelming number of nations involved and the extraordinary number of theatres—from Europe and the Soviet Union to North Africa, China, South East Asia and the Pacific. In World War I non-European theatres had seen quick and short colonial battles, but in World War II these theatres demanded far more resources and human sacrifice.

Related Topics:
September 3 - 1939 - 1945 - World War I - World war

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