Puerto Rico's History By sarahebel Apr 25, 1898 United States delcares War May 1, 1898 Battle of Manila Bay Jun 21, 1898 Guam Captured Jun 22, 1898 United States troops land in Cuba Jul 1, 1898 Battle of San Juan Hill and El Caney Jul 17, 1898 Santiago is captured Jul 25, 1898 Puerto Rico is invaded Aug 10, 1898 Manila Bay captured and the Spanish surrender shortly thereafter Dec 10, 1898 Peace Treaty is signed