The events that led the United States to join the first world war on the side of the Allies include the following
World War I, also known as the Great War, began in 1914 after the assassination of Franz Ferdinand of Austria. His murder catapulted into a war across Europe that lasted until 1918.
At first, the United States under the administration of President Wilson remained Neutral. However, constant provocation by Germany such as Sinking of the Lusitania on May 7, 1915, which killed about 120 Americans, Germany’s attacks on American ships, Attempts by Germany to meddle in U.S.-Mexican relations (Zimmermann Telegram) propelled the United to reconsider its neutrality. Later on, the United States joined the allies which also included Great Britain, France and Russia.
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