Final answer:
Germany's Unrestricted Submarine Warfare led to the sinking of the Lusitania, the Zimmerman Telegram, and President Wilson's intervention, impacting American neutrality in WWI.
Explanation:
Germany's policy of Unrestricted Submarine Warfare eventually contributes to the sinking of the Lusitania, which led to a significant shift in American public opinion towards entering World War I. The sinking of the Lusitania, a passenger ship with American citizens onboard, raised concerns and tensions between the United States and Germany.
Furthermore, the Zimmerman Telegram intercepted in January 1917, where Germany proposed an alliance with Mexico against the United States, contributed to the end of American neutrality in World War I. Additionally, President Wilson's call for an end to unrestricted submarine warfare in 1916 and the Germans signing the Sussex Pledge demonstrated the impact of submarine warfare on international relations.
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