Why were Americans so critical of the handling of the war with Spain? What lessons did the U.S. learn from the Spanish American War?

Why were Americans so critical of the handling of the war with Spain? What lessons did the U.S. learn from the Spanish American War?
What legacy did the war have for the future of the U.S.?
Your response should be at least 200 words in length

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Book Refernce: For the common defense: A military history of the united states from 1607-2012

Allan R Millett, Peter Maslowski, ans William B Feis