Answer:
Cuba, Puerto Rico, The Philippines
Explanation:
Cuba: A significant portion of the war was fought in Cuba, which was a Spanish colony at the time. The United States intervened in the Cuban War of Independence, which was a conflict between the Cuban rebels and the Spanish government, and helped the Cuban rebels to achieve victory.
Puerto Rico: The United States also invaded and occupied Puerto Rico, which was another Spanish colony, during the war.
The Philippines: The United States also intervened in the Philippine Revolution, which was a conflict between the Philippine rebels and the Spanish government, and helped the Philippine rebels to achieve victory.
