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The Zimmermann Telegram showed that Germany would be willing to fight the United States, fund its enemy and support its loss of territory.

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With harassing the United States, lying to it, and killing its citizens, America was justified in declaring war against Germany, even if Germany didn't intend to fight them.

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https://www.ourdocuments.gov/document_data/document_images/doc_060_big.jpg

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After promising that they would regulate sinking boats only to military ones, Germany proceeded to break this pledge, and began killing civilians, including Americans, again.

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When the US was still neutral in the war, Germany sunk the Lusitania, killing over 120 Americans, and changing worldwide opinion of Germany.

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Arthur Zimmermann sent the telegram to Mexico talking about how they would fund Mexico in a war against the US, but only if the US started it. It's not good to ignore that they talked about a hypothetical war that the US would start instead of how they would declare war against the US.

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Germany didn't want to risk any supplies going through to their enemies

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Germany didn't want to risk any supplies going through to their enemies

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Germany was already blockaded by the British Empire, starving them. They couldn't let supplies go to Britain, or else one side would be starving and the other would win easily, with all the resources they would need

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The Sussex Pledge was a promise from the German government to the United States saying that they wouldn't sink any non-military ships and merchant ships that are searched. Less than a year after the pledge though, on February 1, 1917, Germany broke this and started unrestricted submarine warfare again.

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https://www.thoughtco.com/the-sussex-pledge-1222117

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Less than a year after the war started, Germany was already terrorizing allied ships, both military and civilian. An example of this  was the Sinking of the Lusitania, a civilian ship with almost 2,000 people on board. Germany sunk it with a U-boat, killing more than half of the passengers, including more than 120 Americans. This changed worldwide public opinion of Germany.

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http://www.history.com/topics/world-war-i/lusitania

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https://www.archives.gov/education/lessons/zimmermann

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http://www.socialstudieshelp.com/usra_wwi.htm

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The Zimmermann Telegram was a message sent from the German foreign minister, Arthur Zimmermann, to the Mexican government suggesting that they would be able to win back lost territory from the United States if they joined the Central Powers in World War I. Britain intercepted this telegram, decoded it and sent it to America.

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http://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=1172287&site=eds-live

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Side with America on this one, but maybe have a "despite" because Germany definitely has a side too

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http://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=630712&site=eds-live

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World War I and the Origins of U.S. Military Intelligence

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World War I and the Origins of U.S. Military Intelligence

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http://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=495745&site=eds-live

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http://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=200827&site=eds-live

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http://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=1501133&site=eds-live

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Primary sources above. Secondary sources below.

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World War I was one of the worst wars of all time. In 1914, when the war began, the United States stayed neutral. But because of attacks on American citizens, broken promises, and plotting war from Germany, the United States was justified in declaring war against Germany.

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Was America's declaration of war against Germany justified?

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Because of attacks on American citizens, broken promises, and plotting war from Germany, the United States was justified in declaring war against Germany.