If I fail this text I fail my class :(

There are 3 question left please help me

Answer and Explanation:

The answer is All of the Above.

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In early 1915, Germany introduced a policy of unrestricted submarine warfare in the Atlantic. This meant U-Boats were hunting and sinking merchant shipping without warning. The RMS Lusitania left New York on 1st May, 1915, bound for Liverpool. On 7th May it was spotted off the coast of Ireland by U-20 and torpedoed. Of 1,962 passengers, 1,198 lost their lives. Among the dead were 128 Americans, causing widespread outrage in the US.

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In January 1917, the German diplomatic representative in Mexico received a secret telegram penned by German Foreign Secretary Arthur Zimmermann. It proposed a secret alliance between Germany and Mexico, should the United States enter the war. If the Central Powers were to win, Mexico would be free to annex territory in New Mexico, Texas and Arizona. Unfortunately for Germany, the telegram was intercepted by the British and decrypted by Room 40. The British passed the document to Washington and it appeared on the front page of American newspapers on 1st March.

This combination of factors turned public opinion around. On 6 April, the United States declared war on Germany and began to mobilize. The first American troops arrived in Europe in June.

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Germany resumed unrestricted submarine warfare in 1917. Knowing they risked provoking the United States into joining the war, Germany gambled on defeating the British before the US had a chance to mobilize. During February and March, several US cargo vessels were sunk without warning, resulting in the United States severing diplomatic ties with Berlin.

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