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The heir to the Austro-Hungarain throne, and Archduke. He visited the Bosian capital of Sarajevo. As he adn his wife rode through the city, a Bosnain revolutionary named Gavrilo princip rushed their car open and shot the couple.
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When Austria declared war of Serbia, Russia immediately mobilized its army, including troops stationed on the German border.
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Germany had been long perpared for war against France and Russia, with a massive plan of invasion.
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Germany declared war on France but their plan had one major problem. it required German force4s to advance through neutral Belgium in order to encircle the French troops.
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The British had guaranteed Belgiums neutrality.
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After German troops crossed the Belgian Frontier, Britain declared war on Germany.
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Austria-Hungary declared war on Russia because Russia was helping defend Serbia.
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Austria-Hungary, declares war on Russia and demands the neutrality of Russia's ally France; France refuses and mobilises.
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German U-boats sank the passenger liner Lusitania. Among those who drowned were 128 Americans.
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The Zimmermann Telegram was a 1917 diplomatic proposal from the German Empire to Mexico to make war against the United States.
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On April 6, Congress granted the request and the United States was formally at war with Germany. Several key events leading up to this act included the sinking of the Lusitania in 1915, and the Zimmerman Telegram sent to Mexico by Germany in January 1917.
