Which of the following was not a reason that the united states declared war against spain in 1898? . . . . .
a. the u. s.s. maine blew up in havana harbor. . . . .
b. american newspaper publishers pushed public opinion in favor of war. . . . .
c. spanish authorities mistreated the people of cuba. . . . .
d. josé martí led spanish troops in an attack on ybor city, florida. .