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Because the Lusitiana was never sunk. The US tries to remove themselves as much as possible from the war. President Wilson feels less pressure to join the war.
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President Wilson tried to bring peace between the countries in war. US acts as a mediator rather than a powerful force.
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Germany limits their submarine attack to try not to provoke US into joining the War. Which gives me full focus on their European enemies.
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Without American Troops, the Allied forces are weak and losing the advantage. Germany temporarily gains advantages.
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A negotiated armistice deal ends the war without the US invovlment. Which changes Europes post-War future