Unificación Puertorriqueña Tripartita (Tripartite Puerto Rican Unification) was political party [1] in Puerto Rico founded on 14 July 1940. [2] It resulted from the merger of three political parties: Partido Liberal Puertorriqueño, Partido Unión Republicana Progresista and Partido Laborista Puro. [3] It supported statehood for Puerto Rico as its major tenet. [4]