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The archduke was assassinated by Gavrilo Princip who was apart of the serbian terrorist group.
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Austria-Hungary declares war on Serbia
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Allied forces halt German advance into France
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Germany begins naval blockade of Great Britain
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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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Germany begins the attack on Verdun
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Allied offensive begins the Battle of the Somme
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The US declares war on Germany due to them sinking the lusitania, killing 128 americans and trying to send the Zimmerman note to Mexico
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By the terms of the Treaty of Brest-Litovsk, Russia recognized the independence of Ukraine, Georgia and Finland; gave up Poland and the Baltic states of Lithuania, Latvia and Estonia to Germany and Austria-Hungary; and ceded Kars, Ardahan and Batum to Turkey
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The treaty's so-called “war guilt” clause forced Germany and other Central Powers to take all the blame for World War I. This meant a loss of territories, reduction in military forces, and reparation payments to Allied powers