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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 occurred in Sarajevo when Serbian nationalist Gavrilo Princip assassinated Archduke Franz Ferdinand of Austria-Hungary. This single act triggered a chain reaction of events due to the complex alliance system in Europe, ultimately leading to global warfare.

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Germany's invasion of neutral Belgium brought Britain into the war and demonstrated German disregard for international treaties. This violation of Belgian neutrality would later influence American public opinion against the Central Powers and contribute to the U.S. perception of German aggression.

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German U-boat U-20 torpedoed the British passenger liner Lusitania off the coast of Ireland, killing 1,198 people including 128 Americans. This event marked a turning point in American public opinion, though the U.S. would not enter the war for nearly two more years. The incident highlighted Germany's unrestricted submarine warfare policy.

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February 1915: Germany Announces Unrestricted Submarine Warfare

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February 1915: Germany Announces Unrestricted Submarine Warfare

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Germany declared the waters around Britain a war zone and announced unrestricted submarine warfare, threatening to sink any vessel found in these waters. This policy directly challenged American neutrality and freedom of the seas, creating significant tension between Germany and the United States.

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January 1917: Zimmermann Telegram Intercepted

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January 1917: Zimmermann Telegram Intercepted

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British intelligence intercepted and decoded a secret telegram from German Foreign Minister Arthur Zimmermann to Mexico, proposing a military alliance if the U.S. entered the war. Germany promised to help Mexico recover Texas, New Mexico, and Arizona. When published in American newspapers, this telegram outraged the American public and significantly shifted opinion toward war.

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February 1917: Germany Resumes Unrestricted Submarine Warfare

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February 1917: Germany Resumes Unrestricted Submarine Warfare

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Despite previous promises to limit submarine attacks, Germany resumed unrestricted submarine warfare, hoping to starve Britain into submission before America could effectively enter the war. This decision violated earlier agreements and directly threatened American ships and lives, pushing the U.S. closer to war.

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April 2, 1917: President Wilson Asks Congress for War Declaration

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April 2, 1917: President Wilson Asks Congress for War Declaration

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President Woodrow Wilson appeared before a joint session of Congress to request a declaration of war against Germany. In his famous speech, Wilson declared that 'the world must be made safe for democracy.' Congress voted to declare war on April 6, 1917, officially ending American neutrality and marking the nation's entry into World War I.

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June 1917: First American Troops Arrive in France

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June 1917: First American Troops Arrive in France

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The first contingent of the American Expeditionary Forces (AEF) under General John J. Pershing arrived in France. This marked the beginning of significant American military involvement in Europe. Pershing famously declared 'Lafayette, we are here!' at Lafayette's tomb, symbolically repaying France's assistance during the American Revolution.