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The Rough Riders was a nickname for the 1st United States Volunteer Cavalry, a unit created in 1898 to fight the Spanish-American War. Its first leader was Colonel Leonard Wood, and after he left, future president Theodore Roosevelt took the reins. 
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The rough riders were the first voluntary cavalry in the Spanish-American War. Theodore Roosevelt was the Assistant Secretary of the Navy. He resigned in 1898 to organize the Rough Riders.

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