What policy aimed to liberate Cuba from Spanish rule in the late 1800s?

The Teller Amendment is the correct choice as it was specifically enacted to address the situation in Cuba during the late 1800s, particularly during the Spanish-American War. This amendment, passed in 1898, declared that the United States would not annex Cuba and that its intent was to help liberate the island from Spanish rule. By affirming that the U.S. would respect the sovereignty of Cuba, the amendment aimed to assuage concerns that American intervention was motivated by imperialistic ambitions.

The Monroe Doctrine primarily focused on opposing European colonialism in the Americas but did not specifically address Cuba's liberation from Spain. The Roosevelt Corollary extended the Monroe Doctrine by asserting international police power in the Western Hemisphere but is not related to the Spanish-American conflict. The Open Door Policy was aimed at ensuring trade rights in China and did not pertain to Cuban liberation. Thus, the Teller Amendment clearly stands out as the policy directly related to supporting Cuban independence from Spanish colonial control.