Spanish–American War: American troops enter the city of Mayagüez, Puerto Rico.

The Spanish–American War was fought between Spain and the United States in 1898. It began with the sinking of the USS Maine in Havana Harbor in Cuba, and resulted in the U.S. acquiring sovereignty over Puerto Rico, Guam, and the Philippines, and establishing a protectorate over Cuba. It represented U.S. intervention in the Cuban War of Independence and Philippine Revolution, with the latter later leading to the Philippine–American War. The Spanish–American War brought an end to almost four centuries of Spanish presence in the Americas, Asia, and the Pacific; the United States meanwhile not only became a major world power, but also gained several island possessions spanning the globe, which provoked rancorous debate over the wisdom of expansionism.

Mayagüez is the ninth-largest municipality in Puerto Rico. It was founded as Pueblo de Nuestra Señora de la Candelaria de Mayagüez, and is also known as La Sultana del Oeste, Ciudad de las Aguas Puras, or Ciudad del Mangó. On April 6, 1894, the Spanish Crown granted it the formal title of Excelente Ciudad de Mayagüez. Mayagüez is located in the center of the western coast on the island of Puerto Rico. It has a population of 73,077, and it is the principal city of the Mayagüez Metropolitan Statistical Area and the Mayagüez–Aguadilla, PR Combined Statistical Area.