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June 28, 1914: Assassination of Archduke Franz Ferdinand

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June 28, 1914: Assassination of Archduke Franz Ferdinand

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The spark that ignited World War I: Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife Sophie were assassinated in Sarajevo by Serbian nationalist Gavrilo Princip. This event set off a chain reaction of alliances that would pull Europe into war.

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July 28, 1914: Austria-Hungary Declares War on Serbia

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July 28, 1914: Austria-Hungary Declares War on Serbia

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One month after the assassination, Austria-Hungary declared war on Serbia, officially beginning World War I. This triggered a cascade of alliances, with Russia mobilizing to defend Serbia.

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Germany declared war on Russia and France, and invaded neutral Belgium to attack France. This action brought Britain into the war. The major European powers were now all involved in what would become known as 'The Great War.'

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A German U-boat torpedoed and sank the British passenger ship RMS Lusitania, killing 1,198 passengers, including 128 Americans. This event began to shift American public opinion against Germany, though the U.S. remained neutral.

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British intelligence intercepted a secret German diplomatic communication proposing a military alliance with Mexico against the United States. This telegram, when made public, outraged Americans and helped push the U.S. toward war.

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April 6, 1917: United States Enters the War

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April 6, 1917: United States Enters the War

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After years of neutrality, the United States formally entered World War I by declaring war on Germany. President Woodrow Wilson called for the U.S. to help 'make the world safe for democracy.'

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Under General John J. Pershing, over 2 million American soldiers served in France. The fresh American troops helped turn the tide of war in favor of the Allies. U.S. involvement boosted Allied morale and brought new resources to the fight.

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Germany launched its last major offensive on the Western Front. Though initially successful, the attack eventually failed as Allied forces, including fresh American troops, held their ground and began pushing back.

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Allied forces launched the Hundred Days Offensive, a series of attacks that finally broke German resistance. American forces played a crucial role in major battles including the Meuse-Argonne Offensive, the largest battle in U.S. military history.

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At 11:00 AM on the 11th day of the 11th month, the Armistice between Germany and the Allies took effect, ending World War I. The 'War to End All Wars' was finally over, leaving more than 16 million people dead worldwide.

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The war officially ended with the signing of the Treaty of Versailles. President Wilson's '14 Points' influenced the treaty, which included the creation of the League of Nations. However, the harsh terms imposed on Germany would later contribute to the rise of Nazi Germany and World War II.