The Philippine Revolution was a war of independence waged by the revolutionary organization Katipunan against the Spanish Empire from 1896 to 1898. It was the culmination of the 333-year colonial rule of Spain in the archipelago. The Philippines was one of the last major colonies of the Spanish Empire, which had already suffered a massive decline in the 1820s. Cuba rebelled in 1895, and in 1898, the United States intervened and the Spanish soon capitulated. In June, Philippine revolutionaries declared independence. However, it was not recognized by Spain, which sold the islands to the United States in the Treaty of Paris.