World War II was the deadliest war in human history. The six-year war ravaged Europe and Japan and left millions of people dead.

The political, social, and economic causes and ramifications of the war will be studied and debated for centuries to come.

Here are 13 facts about the destructive war.

13.

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12.

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11.

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10.

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9.

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8.

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7.

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6.

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5.

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4.

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3.

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2.

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1.

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