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Period: to
Second World War
World War II was a global military conflict. It involved most of the nations of the world, including all the great powers, grouped into two opposing military alliances: the allies of the Second War World and Axis Powers.
More information:
https://historia.nationalgeographic.com.es/temas/segunda-guerra-mundial
Video:
https://youtu.be/AYQ8hT8cVTE -
Period: to
Atomic bombing of Japan