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Most of the world had set its currency to gold, this connected almost the entire world
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Theodore Roosevelt becomes president of the United States
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The Sixteenth Amendment was ratified which authorized income tax.
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WWI begins
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The Lusitania ship is sunk by Germany. This was a US ship and it is one of the main reasons the US joined the war,
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The United States finally makes the decision to join the war.
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WWI ends. This is the end of the first war between the entire world.
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The treaty signed in France that officially ends WWI
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Woman are allowed to vote after the nineteenth amendment is ratified.