How did the reporting of the USS Maine sinking lead to an American declaration of war in 1898?

The sinking of the USS Maine lead to the Spanish-American War because the American battleship was docked in Cuba, then a Spanish territory. When it blew up alot of American citizens thought it was the Spanish because it was docked on a Spanish island. The Spanish however told the US that it was rebels that blew it up. To this day no one knows who or what blew up the US battleship USS Maine.