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Mexican soldiers arrested American sailors at Tampico, a Mexican port. This action was used as leverage against Mexico.
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The Archduke of the Austro-Hungarian Empire was assassinated by Gavrilo Princip, leading to the first world war.
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Lenin's Bolshevik Revolution succeeded, toppling over the old Russian oligarchy. This lead to Russia leaving the World War I scene.
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The United States joined the First World War as a result of numerous factors, including the Zimmermann Telegram and submarine strikes.
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Drafted by Wilson, the Fourteen Points were a series of terms which attempted to not only resolve the current conflict, but to ensure peace thereafter.
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Exacerbated racial tensions ensued as white supremacists sparked riots. This occurred over a wide range of cities across the nation, including Washington D.C.
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The 18th Amendment was passed, which prohibited the sale of alcohol, and imposed numerous other restrictions on alcohol. This Amendment was overturned in the future due to its passage only making the problem worse.
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The 19th Amendment was certified, allowing women to vote. This also prevented the government from ever denying one the right to vote on account of their sex.