(A) Spain
(B) Mexico
(C) ** Cuba
(D) Philippines
EXPLANATIONS BELOW
Concept note-1: -The main issue was Cuban independence. Revolts had been occurring for some years in Cuba against Spanish colonial rule. The United States backed these revolts upon entering the Spanish–American War.
Concept note-2: -The reasons for war were many, but there were two immediate ones: America’s support the ongoing struggle by Cubans and Filipinos against Spanish rule, and the mysterious explosion of the battleship U.S.S. Maine in Havana Harbor.
Concept note-3: -Representatives of Spain and the United States signed a peace treaty in Paris on December 10, 1898, which established the independence of Cuba, ceded Puerto Rico and Guam to the United States, and allowed the victorious power to purchase the Philippines Islands from Spain for $20 million.
Concept note-4: -The Spanish-American War was a conflict between the United States and Spain that effectively ended Spain’s role as a colonial power in the New World. The United States emerged from the war as a world power with significant territorial claims stretching from the Caribbean to Southeast Asia.
Concept note-5: -The United States had millions of dollars invested in businesses in Cuba and there were many U.S. citizens in residence there. The U.S. also traded goods with Cuba. In 1898, the United States assisted in war to protect its citizens and businesses in Cuba.