1.what was one cause of the spanish-american war? president mckinley's enthusiasm for going to war theodore roosevelt's interest in increasing the size of the navy the belief that a spanish mine had blown up the battleship maine cuban intervention in u. s. affairs 2.how did many americans respond to the declaration of war on spain? most believed the army was not prepared to fight. they feared a spanish conquest of florida. tens of thouands demonstrated against it. many men volunteered for military service. 3.the sensationalist style of news coverage called sway u. s. public opinion in favor of war with spain national lampooning fake news yellow journalism