In 1914 Germany invades Belgium and their action were reported by the American press and in propaganda. In 1915 a British Naval blockade was designed to cut off supplies to Germany, but it affected US trade as well and German U-Boats(submarines) sank the Lusitania, which was a British ocean liner with Americans on board. The US then received promises from Germany in the Sussex Pledge that his would never happen again. In 1917 Germany sent the intercepted Zimmerman Telegram, hoping to persuade Mexico to attack the U.S. German foreign secretary Arthur Zimmerman to the German minister in Mexico. The note reveals a plan to renew unrestricted submarine warfare and to form an alliance with Mexico and Japan if the United States declared war on Germany. The message was intercepted by the British and passed on to the United States; its publication caused outrage and contributes to the U.S. entry into World War 1.

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