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"Relieved pressure on the Eastern Front, allowing Germany and Austria-Hungary to redirect their forces to the Western Front against the Allies."
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The sinking of the Lusitania, a British ocean liner, by a German submarine.
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"The Zimmermann Telegram revealed Germany's hostile intentions towards the United States. It demonstrated Germany's willingness to encourage Mexico, a neighboring country, to wage war against the U.S."
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"The publication of the Zimmermann Telegram in American newspapers in March 1917 stirred public outrage. It became a rallying point for those advocating for U.S. involvement in the war. "
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The Russian Revolution started the overthrow of the Tsarist regime "and the rise of the Bolsheviks to power under the leadership of Vladimir Lenin."
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"President Wilson asked Congress to declare war on Germany"
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"Unrestricted submarine warfare was a policy employed by Germany in early 1917, wherein German submarines, also known as U-boats, would sink any ship, including civilian vessels, in designated war zones around the British Isles and, later, in the waters around France and Italy."