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Archduke Franz Ferdinand of Austria, the heir to the hungarian-austrian throne is assassinated with his wife in Bosnia. His assassination led to the first world war.
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Britain, an ally of the US declares war on Germany because of their invasion of the neutral Belgium.
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German submarine sinks passenger ship traveling to England. 128 americans die.
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British Intelligence intercepts a telegram sent by Germany to Mexico stating if Mexico aids Germany by joining the war, Germany will help regain the land Mexico ceded to the US.
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Woodrow Wilson narrowly defeats Charles Evan Hughes to become the president of the United States.
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The United States finally declares war on Germany, entering World War 1. This is a response by Woodrow Wilson to the sinking of American ships.
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The first American troops touch down in France. 14,000 infantry troops land at the port of Saint-Nazaire.
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Made it a crime to publish any false or malicious writing about the government. The Wilson administration said this was necessary for the war effort and was directed at socialists, pacifists, and other anti-war activists.
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Germany signs a ceasefire at Le Francport near Compiègne, this ends fighting on water, land and air between Germany and the allies. This includes the US
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Allied and German representatives sign treaty of Versailles. This ends the first world war. The United States also signs treaty of guaranty, pledging to defend France in case of an unprovoked attack by Germany.