What event trigged the outbreak of the spanish american war

the United States declared war on Spain following the sinking of the Battleship Maine in Havana harbor on February 15, 1898.

your answer would be (a)

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity