Sugar and U.S. banking interests. These bank syndicates also owned the insular postal system, the coastal railroad, and the San Juan international seaport. Taking Puerto Rico was seen as a part of American "Manifest destiny." The American government supported American corporations with military force on occasion. After Puerto Rico was invaded during the Spanish–American War in 1898, Manuel Zeno Gandía traveled to Washington, D.C. where, together with Eugenio María de Hostos, he proposed the idea of independence for Puerto Rico. The men were disappointed when their ideas were rejected by the US government and the island was organized as a US territory. Zeno Gandia returned to the island and continued as an activist. A number of leaders, including a well-known intellectual and legislator called José de Diego, sought independence from the United States via political accommodation. On June 5, 1900, President William McKinley named De Diego, together with Rosendo Matienzo Cintrón, José Celso Barbosa, Manuel Camuñas, and Andrés Crosas to an Executive Cabinet under U.S.-appointed Governor Charles H. Allen. The Executive Cabinet also included six American members. De Diego resigned from the position in order to pursue independence. In 1904, he co-founded the Unionist Party along with Luis Muñoz Rivera, Rosendo Matienzo Cintrón and Antonio R. Barceló. De Diego was elected to the House of Delegates, the only locally elected body of government then allowed by the U.S., over which De Diego presided from 1904 to 1917. The House of Delegates was subject to the U.S. President's veto power and unsuccessfully voted for the island's right to independence and self-government. It petitioned against imposition of U.S. citizenship to Puerto Ricans in 1917, but the US granted citizenship to island residents. Despite these failures, De Diego became known as the "Father of the Puerto Rican Independence Movement." The newly created Puerto Rico Union Party advocated allowing voters to choose among non-colonial options, including annexation, an independent protectorate, and full autonomy. Another new party called the Puerto Rico Independence Party emerged, founded by Rosendo Matienzo Cintrón in 1912, which promoted Puerto Rico's independence. That same year, Scott Colón, Zeno Gandía, Matienzo Cintrón, and Luis Lloréns Torres wrote a manifesto for independence. The Independence Party was the first party in the history of the island to openly support independence from the United States as part of its platform. Through the 1930s, U.S. banking interests and corporations expanded their control of lands throughout Latin