What conflict resulted in Cuba, Puerto Rico, the Philippines, and Guam becoming American territories?

The Spanish-American War was the conflict that led to Cuba, Puerto Rico, the Philippines, and Guam becoming American territories. This war, which occurred in 1898, was primarily sparked by the United States' support for the independence of Cuba from Spain. The war concluded with a decisive victory for the United States, and as a result, the Treaty of Paris was signed, ceding these territories from Spain to the U.S.

The acquisition of these territories marked a significant expansion of American influence and control, reflecting a shift in U.S. foreign policy towards imperialism during this period. Cuba became a protectorate of the United States, while Puerto Rico and Guam were formally annexed as U.S. territories, and the Philippines was acquired after a brief conflict following the war.

The other conflicts mentioned do not relate to the acquisition of these specific territories by the United States. World War I occurred decades later and did not involve territorial changes from Spain. The Battle of San Juan Hill was an important battle within the Spanish-American War but does not encompass the broader ramifications of the war itself. The Mexican-American War led to the acquisition of several western territories but is unrelated to the subjects of this question.