Final answer:
The story published in newspapers that resulted in U.S. public outrage pertained to Spanish atrocities in Cuba, with yellow journalism playing a significant role in shaping public opinion. José Martí's efforts and the USS Maine explosion were also pivotal events that led to American intervention in the Cuban War of Independence.
Step-by-step explanation:
The story published in newspapers that led to outrage among U.S. citizens and demands for action in Cuba was related to the inhumane treatment of Cubans by the Spanish forces during Cuba's fight for independence. Stories were sensationalized through the use of yellow journalism by major newspapers, notably those owned by William Randolph Hearst and Joseph Pulitzer, which featured provocative stories of Spanish atrocities to garner support for the Cuban cause.
A prominent figure in the Cuban independence movement was José Martí, whose efforts were widely recognized and who became a symbol of the campaign in the United States after his death in battle in 1895. However, it was not until the USS Maine exploded in Havana Harbor that the U.S. officially intervened in the Cuban War of Independence, influenced by both humanitarian concerns and American business interests in Cuba.