Who did the US declare war on in 1898 after the sinking of the Maine?

In 1898, the United States declared war on Spain following the sinking of the USS Maine in Havana Harbor. The explosion of the battleship, which was attributed to Spanish sabotage by sensationalist media, fueled public outrage and calls for intervention. This conflict, known as the Spanish-American War, resulted in the U.S. gaining territories such as Puerto Rico, Guam, and the Philippines.