El Morro's last active fight occurred during a naval bombardment by the United States Navy during the 1898 Spanish-American War. Ending the age of naval warfare in the Caribbean, at least in the classical sense. During the Spanish-American War, the castle was attacked at least three times by American naval forces, the most major of which being the Bombardment of San Juan on May 12, 1898.
The short war ended with the signing of Treaty of Paris. Spain ceded ownership of the islands of Puerto Rico, Cuba, Guam, and the Philippines to the United States.
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