Final answer:
The U.S. action that ultimately triggered a new rebellion in Cuba was the dispatch of the USS Maine to Havana harbor in 1898, along with the influence of yellow journalism and American interests in the region. An explosion on Maine set the stage for U.S. intervention in the Cuban War of Independence, resulting in the Spanish-American War.
Step-by-step explanation:
The U.S. action in 1894 that set off a new rebellion in Cuba was indirectly related to the U.S. government's increasing involvement and interest in Cuban affairs. The actual eruption of conflict, however, was more directly triggered by events that transpired in 1898. In early 1898, due to growing instability in Cuba and protection of U.S. interests, President McKinley sent the battleship Maine to Havana harbor to protect American citizens and property. The destruction of the USS Maine in February sparked U.S. intervention in the Cuban struggle for independence. Yellow journalism played a significant role in shaping public opinion and pushing the U.S. toward war with Spain.
While there was no singular action in 1894 directly provoking the rebellion, the cumulative effect of American economic ties and strategic interest in Cuba, along with the sympathy for Cuban independence, primed the U.S. to intervene. Following the explosion of the USS Maine, President McKinley delivered a war message to Congress in 1898, which concluded with Congress declaring war on Spain under the banner of liberating Cuba. The subsequent conflict, known as the Spanish-American War, marked a turning point in U.S.-Cuban relations and led to the end of Spanish rule in Cuba.