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World War I Germany's unfettered submarine warfare against American ships during World War I provoked the U.S. into abandoning the neutrality it had upheld for so many years. The country's resultant participation in World War I against the Central Powers marked its first major departure from isolationist policy.
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Johannes Gutenburg is the answer you're looking for.
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One of the main reasons why Bismarck wanted to control the territories of Alsace and Lorraine was mostly because both territories were plentiful and useful territories to have in any country as they were quite developed. It was also good for strategic reasons.