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The Archduke of Austria-Hungary was shot by Gavrilo Princip. This is often seen as the spark for WW1 which would escalate because of alliances that support each other in war.
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Germany declares war on France, then Germany invades Belgium and because of that Britain sends a threat, but Germany rejects or ignores it, so Britain goes to war with Germany.
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Germany declared submarine warfare on The United Kingdom and during that Germany sunk the Lusitania and caused naval blockade for Germany.
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Wilson was reelected as president of the United States barely and this was significant in the war as he made the peace treaty for the League of Nations.
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A message very beneficial for Germany and Mexico was deciphered in January 1917 by Russia and its allies and because of this information/intel the United States were kinda forced into war against Germany along with the United States allied countries.
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The US joined the fight in WW1 allied with Britain, France, and Russia against Germany and its allies because of Germany's intentions and Wilson requested declaration of war and it was approved by congress in December of 1917.
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Congress passes the Espionage Act to prevent citizens from releasing info of the war.
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The Spanish Flu or Influenza had killed more people than in WW1 as it had killed 20 to 40 million people worldwide as it was a global disaster.
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The Sedition Act is passed to lock anyone up for the chance of false, wrong, malicious writings against the United States.
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Germany and the Central Powers sign an Armistice (Treaty) that stops WW1 fighting across all elements.
