What were the main causes of the Spanish-American War?

The main causes of the Spanish-American War include American imperialism, the explosion of the USS Maine, and U.S. support for Cuban independence, making this the correct choice.

During the late 19th century, the United States was increasingly driven by imperialist ambitions, looking to expand its influence and territory. This trend was fueled by a mix of nationalism and economic interests, as expansion was seen as a way to assert power on the global stage.

The explosion of the USS Maine in Havana Harbor in February 1898 served as a significant catalyst for war. Although the exact cause of the explosion was disputed, it stirred public sentiment against Spain, with cries of "Remember the Maine!" galvanizing American support for intervention.

Furthermore, U.S. support for Cuban independence from Spanish rule played a critical role. Many Americans felt empathy for the Cuban struggle against colonial oppression and were motivated by the desire to aid their fight for freedom. This combination of factors—imperialistic ambitions, the rallying cry following the Maine's explosion, and a commitment to supporting Cuban independence—coalesced into a groundswell of public and political support for entering the war against Spain in 1898.

The other options do not align with the historical causes of