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Archduke Francis Ferdinand is assassinated.

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Austria Hungary declares war on Serbia, beginning World War I. Germany declared war on Russia, Serbia’s ally, and invaded France Belgium, which then caused Britain to declare war on Germany.

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Germany invades Luxembourg and Belgium. France invades Alsace. British forces arrive in France. countries allied towards Germany had been finally to include great Britain, Russia, Italy, Australia, New Zealand, South Africa, Rhodesia, Romania, Greece, France, Belgium, u.s., Canada, Serbia, India, Portugal, Montenegro, and Poland.

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Austria Hungary invades Russia.

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Allied forces halt German advance into France during First Battle of the Marne.

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Allied forces land on the Gallipoli Peninsula of the Ottoman Empire.

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German submarine sinks the passenger liner Lusitania during crossing from New York to Liverpool, England, killing 128 Americans.

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Battle of Verdun ends with 550,000 French and 450,000 German casualties

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The United States declares war on Germany.

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Germany signs the Armistice at Compegne, ending World War I.