The Union of Puerto Rico (, UPR), also known as the Unionist Party (Spanish: Partido Unionista, PU), was a major political party in Puerto Rico in the early 20th century. The Union of Puerto Rico was known as the dominant political party of the island from 1904 to 1932. UPR founder Luis Muñoz Rivera also founded La Democracia, which effectively acted as the UPR publication. On 19 February 1904, the Union of Puerto Rico party became the first mass party to advocate for independence for Puerto Rico in the form of a sovereign nation. Founding Union of Puerto Rico was founded in February 1902 by Luis Muñoz Rivera, Rosendo Matienzo Cintrón, Antonio R. Barceló, José de Diego, Juan Vías Ochoteco and others after the disbanding of the Federal Party following the party's withdrawal in the election of 1900. The party formed under a platform of greater autonomy for Puerto Rico as a result of the group's dissatisfaction, and frustration, with the Foraker Act. Platform Autonomy The UPR, initially, had a platform that pushed for the separation of the cabinet and legislature, for Puerto Ricans to have more cabinet positions, for a less powerful governor and the governor's appointments in hopes that Puerto Ricans could have more influence and participation within their own government. Jones Act and Realignment From 1913 to 1915 Luis Muñoz Rivera attempted to amend the Jones Act, during its creation, in order to incorporate Puerto Rican autonomy into the act. Rivera attempted to reform the acts incorporation of aspects similar to the older Olmstead Act, especially aspects of United States civil government. Muñoz's campaign for amendments to the eventual Jones act was systemic from the fact he viewed it as "ultra-conservative", and wanted to try and realize Puerto Rican autonomy. The most divisive aspect of the Jones act was United States citizenship for Puerto Ricans. Both Muñoz, and the UPR delegates in Washington opposed Puerto Rican-U.S. Citizenship. Muñoz, in February 1914, introduced his own bill for the continuation of Puerto Rican citizenship- supported by the UPR delegates. However, dejected, the UPR delegates eventually chose to accept the provision "of individual citizenship outlined in the Shafroth bill". Muñoz's patience and diligence regarding the tentative Jones Bill, was challenged by the radical Jose De Diego (another UPR leader) who sought quick resolution for Puerto Rican independence. This division regarding ideology within the party came to be resolved at the