The Spanish-American War was a conflict that lasted ten weeks and was fought in the Caribbean and the Pacific, as part of the Cuban and the Philippine Wars of Independence.
The US had been backing Cuban revolts against Spain for a few years, and anti-Spanish propaganda in the US agitated public opinion against Spain.
The trigger for the conflict was the mysterious sinking of the <em>USS Maine</em> in Havana Harbor. Political pressures from the Democratic party ended up pushing the Republican president William McKinley into a war.
The US Naval power proved decisive, and despite a good performance by Spanish troops, American, Cuban and Philippine forces obtained the surrender of Santiago de Cuba and Manila. The result was the 1898 Treaty of Paris, very favourable to the US.
The treaty gave Americans temporary control of Cuba and ownership of Puerto Rico, Guam and the Philippine Islands. More importantly, it had a huge impact on the national psyche of the Americans. It gave rise to a new debate about the wisdom of expansionism as it gave them possession of several islands spanning the globe.