Final answer:
American sympathy for Cuban rebels during the revolution against Spain was influenced by a shared history of anti-colonial struggle, US economic interests, adherence to the Monroe Doctrine, and a humanitarian response to Spain's brutal tactics.
Step-by-step explanation:
Most of the American people sympathized with the Cuban rebels during Cuba's revolution against Spain for a variety of reasons. Firstly, the Cuban rebellion evoked memories of America's own fight for independence. Americans related to the Cuban's urge for freedom and were driven by reminiscent values of liberty and anti-colonial sentiment, echoing the cry of Cuba Libre.
Secondly, there were strong economic interests at play. US businesses were eager to invest in Cuban agriculture, particularly in the sugar industry, and the potential removal of Spain from the Caribbean was favorable for American investments. Thirdly, the strategic adherence to the Monroe Doctrine suggested that Spain's exit would further American influence in the Western Hemisphere, which aligns with the past drive of preventing European powers from establishing dominion in the region.
Lastly, Spain's brutal tactics to suppress the Cuban rebels triggered humanitarian concerns among Americans. The Spanish military's inhumane treatment of Cubans, including torture and extreme measures against entire villages, stirred American sympathy and support for the Cuban cause. This mingled with America's self-interest and led to significant support for the rebels.