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The assassination of Archduke Franz Ferdinand of Austria and his wife by a Serbian nationalist named Gavrilo Princip. It affected the U.S. by being the triggering event to the start of the war. -
Woodrow Wilson declared the United State's neutrality in the war. This kept the U.S. out of the war, and allowed them to focus on more domestic problems. -
Great Britain declared war on Germany. This is significant to the U.S. because it pushed the country towards being on the Allies' side, leading to increase in trade with Britain and France, and leading to the U.S. joined WWI on the Allies' side. -
Germany was following the Schlieffen Plan, and invaded Belgium to quickly attack France. This caused empathy to grow for the Allies, contributing to the United States' decision to join the war. -
A German U-boat sank the British passenger ship, the Lusitania, causing a large loss of life and considerably increasing tensions between the U.S. and Germany. This was significant to the United States because it was a key factor in their decision to ditch the idea of neutrality and join the war. -
The United States held its presidential election. President Woodrow Wilson was re-elected, beating Republican candidate Charles Evans Hughes. Wilson was the first Democratic president to win a second consecutive term since 1832. Wilson's campaign used popular slogans such as "He kept us out of war" to appeal to those voters who wanted to avoid involvement in war, making the U.S. more against the idea of joining the war. -
British intelligence intercepted a telegram sent by German Foreign Minister Arthur Zimmermann to the German ambassador in Mexico City, known as the "Zimmerman Telegram," which proposed an alliance between Germany and Mexico against the U.S. This was significant to the U.S. because it influenced U.S. public opinion towards entering World War I. -
The United States officially declared war against Germany. This is significant to the U.S. because it brought them into the conflict in the war and was just the start of it. -
On June 25th, 1917, the first American troops arrive in France. The Americans arriving was a relief for the French who were struggling, and this started to turn the tables of WWI in favor of the Allies. -
The United States Congress passed the Sedition Act, which made it illegal to say negative things about the U.S government or the war effort during World War I. This was significant to the U.S because it kept the public positive about the war and the United Sates, and negative propaganda or rumors couldn't spread and distract from war. -
World War I officially concluded with the signing of an armistice between Germany and the Allies. After the war, the United States was left very cautious, which led to violence and discrimination against those who were being viewed as disloyal. German-Americans, immigrants, and socialists were effected the most greatly. -
The Treaty of Versailles was signed by Germany and the Allied Nations, officially ending World War I. This was significant because President Wilson was a strong supporter of the treaty and the League of Nations, which he believed would prevent future wars, which the treaty established.
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