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A Serbian terrorist group kills the heir to the throne of Austria-Hungary. -
Austria- Hungary declares war on Serbia and within a week all major European countries enter the war. -
A British passenger ship is sunk by a German submarine killing 128 Americans. -
The Russian government is overthrown and Russia becomes communist.
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The United States learns that Germany sent a telegram to Mexico trying to get Mexico to attack the U.S. -
The U.S. declares war on Germany and enters WW1. -
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America is victorious in its first independent operation. -
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America signs the Treaty of Versailles to end the war and pledged to defend France in an attack