The Short Version
The claim's core assertions are well-supported by multiple independent academic sources: the Partido Federalista was established on December 23, 1900, is consistently identified as the first formal political party in the Philippines, and advocated for U.S. statehood. However, describing its platform as "cooperation with the United States" understates its actual position, which was outright annexation. The party also operated only until 1907 before transforming into the Progresista Party — context the claim omits.