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the assassination triggered a chain reaction between allied countries, causing tensions to explode and starting World War 1.
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American neutrality in world war 1 was important because it kept the u.s. out of the conflict t first and allowed the nation to stay peaceful and trade with both sides.
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the battle of the marne was important because it stopped germany's advance into france and ended hopes of a quick victory, leading to trench warfare on the western front.
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was important because it killed american passengers and turned u.s. public opinion against germany, pushing the u.s. closer to joining world war 1