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Archduke Franz Ferdinand, heir to the Austrian throne, and his wife continue their visit and get shot. -
Great Britain declares war on Germany. The declaration is binding on all Dominions within the British Empire including Canada, Australia, New Zealand, India and South Africa. The United States declares its neutrality. -
the German U-boat U-20 torpedoed and sank the British luxury liner RMS Lusitania, killing 1,195 people, including 128 Americans -
Democratic U.S. President Woodrow Wilson narrowly defeated Republican Charles E. Hughes in the U.S. presidential election. Republican Jeannette Rankin of Montana became the first woman elected to the United States House of Representatives. -
German Ambassador in Mexico City. The telegram, known as the "Zimmermann Telegram", promised Mexico that Germany would help them regain territory lost to the United States after the Mexican-American War. In exchange, Germany asked for Mexico's support in the war. -
the United States Congress declared war on Germany, officially entering World War I:
The U.S. joined the Allied Powers, which included France, Great Britain, Russia, Canada, Australia, New Zealand, South Africa, and Italy. The U.S. fought against Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria -
the first 14,000 U.S. infantry troops landed in France at the port of Saint Nazaire, marking the beginning of American involvement in World War I -
the United States Congress passed the Sedition Act, a law that expanded the Espionage Act of 1917 -
the day that the Armistice of 11 November 1918 was signed, which ended World War I fighting between the Allies and Germany -
the Treaty of Versailles was signed, officially ending World War
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