The Spanish-American war started primarily because the Hawaiian Navy attacked Washington DC tremendous pressure to defend the US interest in Cuba a revolution broke out in China Russia installed offensive missiles

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in the Americas. The sinking of the USS Maine in Havana harbor in February 1898 further fueled the tensions, and the US declared war on Spain in April of that year.

The US wanted to protect its interests in Cuba, which was fighting for independence from Spanish rule. Additionally, the US was concerned about Spanish influence in the Western Hemisphere and wanted to assert its dominance in the region.

The war ultimately resulted in the US gaining control of Puerto Rico, the Philippines, and Guam from Spain. It also marked the emergence of the US as a global power and set the stage for its increased involvement in international affairs.