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Archduke Franz Ferdinand and his wife were assasinated by Gavrilo Princip, a 19 year old member of the Black Hand.
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Austria rejected Serbia's offer and declared war. Serbia's ally, Russia, took action. Russian leaders ordered the mobilization of troops toward the Austian border.
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On one side was Germany and Austria-Hungary. They were known as the Central Powers. On the other side was Great Britain, France, and Russia. They were known as the Allies.
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Germans had overrun Belgium and swept into France.
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After four days of fighting, the German general gave the order to retreat.
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The only major neutral power besides the United States was Italy. Ottoman Turks and Bulgaria allied themselves with Germany and Central Powers.
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Germans intensified the submarine warfare that had raged in the Atlantic Ocean. Germans announced that their submarines would sink without warning any ship in the waters around Britain. The policy was called unrestricted submarine warfare.
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The United States enters the war on this day.
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The treaty was extremely hard on Russia. It required the Russian government to surrender lands to Germany that now include Finland, Poland, Ukraine, Estonia, Latvia, and Lithuania. These nations gained their independence.
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Allies smashed through German lines. Soon, the Central Powers crumbled. The Bulgarians surrendered first and then Ottoman Turks surrendered.
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Leaders of the victorious nations gathered outside Paris to work out the terms of peace. The peace settlement they had created left many people feeling bitter and betrayed.
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The Treaty of Versailles between German and Allied powers was signed.