On February 15, 1898, the American ship USS Maine mysteriously exploded in the Havana Harbor. News of the blast quickly reached U.S. shores, where it was met by some not with alarm but great enthusiasm. A powerful group of war lovers agitated that the United States exert its muscle across the seas. Theodore Roosevelt and Henry Cabot Lodge were influential politicians dismayed by the "closing" of the Western frontier. William Randolph Hearst's New...