Final answer:
Yellow journalism is a technique of using inflammatory headlines to stir up public emotion. It was used to manipulate public opinion about Cuba by sensationalizing Spain's crimes. Media magnates Hearst and Pulitzer engaged in sensationalist reporting to agitate for war.
Step-by-step explanation:
Yellow journalism is the technique of using inflammatory headlines backed by little or no factual reporting to stir up public emotion. It was used to manipulate public opinion about Cuba by sensationalizing the crimes of Spain in Cuba to increase newspaper circulation. Media magnates William Randolph Hearst and Joseph Pulitzer, through their newspapers, engaged in sensationalist reporting on Spain's crimes in Cuba to agitate for war.