<P> On August 9 , 1898 , American troops that were pursuing units retreating from Coamo encountered heavy resistance in Aibonito and retreated after six of their soldiers were injured . They returned three days later , reinforced with artillery units and attempted a surprise attack . In the subsequent crossfire , confused soldiers reported seeing Spanish reinforcements nearby and five American officers were gravely injured , which prompted a retreat order . All military actions in Puerto Rico were suspended on August 13 , after U.S. President William McKinley and French Ambassador Jules Cambon , acting on behalf of the Spanish government , signed an armistice whereby Spain relinquished its sovereignty over the territories of Puerto Rico , Cuba , the Philippines and Guam . </P>
<P> On August 9 , 1898 , American troops that were pursuing units retreating from Coamo encountered heavy resistance in Aibonito and retreated after six of their soldiers were injured . They returned three days later , reinforced with artillery units and attempted a surprise attack . In the subsequent crossfire , confused soldiers reported seeing Spanish reinforcements nearby and five American officers were gravely injured , which prompted a retreat order . All military actions in Puerto Rico were suspended on August 13 , after U.S. President William McKinley and French Ambassador Jules Cambon , acting on behalf of the Spanish government , signed an armistice whereby Spain relinquished its sovereignty over the territories of Puerto Rico , Cuba , the Philippines and Guam . </P>
when did the united states annexed puerto rico
when did the united states annexed puerto rico
1898
1898