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Archduke Franz Ferdinand of Austria and his wife, Sophie, Duchess of Hohenberg, were assassinated in Sarajevo, Bosnia and Herzegovina. The assassination was a key event that led to the start of World War I. -
Great Britain declares war on Germany. this is important because this is when the war is started -
On May 7, 1915, a German U-boat torpedoed and sank the British luxury liner RMS Lusitania, killing 1,198 passengers and crew members. this created conflict between Germany and the British -
Presidential elections were held in the United States on November 7, 1916. Democratic U.S. President Woodrow Wilson narrowly defeated Republican Charles E. Hughes in the U.S. presidential election. this was an important election considering the war about to come up. -
On January 19, 1917, British naval intelligence intercepted and decrypted a telegram sent by German Foreign Minister Arthur Zimmermann to the German Ambassador in Mexico City. The Zimmermann telegram clearly had helped draw the United States into the war and thus changed the course of the war. -
the United States Congress declared war on Germany, officially entering World War I. this was important because this officially brought us into the war. -
On May 16, 1918, the United States Congress passed the Sedition Act, a law that restricted free speech during wartime. this could lead to 10,000$ fines and over 20 years in prison -
the first 14,000 U.S. infantry troops landed in France at the port of Saint Nazaire. The landing site was kept a secret to avoid German submarines. this played an important role in our war. allowing us to attack secretly and quickly. -
the day when the fighting in World War I officially ceased. this is important because this is when the country's decided to call peace. -
On June 28, 1919, the Treaty of Versailles was signed, officially ending World War I. this is important because this is when they got the official news that the war was over.