Answer:
World War II, also called Second World War, conflict that involved virtually every part of the world during the years 1939–45. ... The principal belligerents were the Axis powers—Germany, Italy, and Japan—and the Allies—France, Great Britain, the United States, the Soviet Union, and, to a lesser extent, China.
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The statement that [the city was well protected and repelled attacks by Invaders] best explains why Constantinople didn't fall until 1453. Since the people were armed and protected, invaders had several problems in breaking to the city at any point.
