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apr 6, 1917 - 美国参战（1917.4.6）

Description:

美国以德国潜艇攻击美国商船为口实，对德宣战，美国的参加，增强了协约国的实力。德国的无限制潜艇战事变，协约国和中立国方面的商船损失减少。

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世界史

9 Aug 2022

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589

Date:

apr 6, 1917

Now

~ 109 years ago

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