Final answer:
The rallying cry for people that wanted a war with Spain in Cuba was "Cuba Libre". Americans supported the Cubans for several reasons, including their desire to invest in Cuban agriculture and further the Monroe Doctrine.
Step-by-step explanation:
The rallying cry for people that wanted a war with Spain in Cuba was Cuba Libre. This phrase, which means "Free Cuba" in Spanish, was shouted by Cuban nationalists for years. It evoked feelings of independence and was reminiscent of America's own struggle for independence from a European monarch.
Americans supported the Cubans for a few main reasons, including their desire to invest in Cuban agriculture and further the Monroe Doctrine. Additionally, the brutal methods used by Spanish commanders to crush the Cuban rebels through fear and intimidation contributed to the desire for war.