The Legislature of La Pampa was established after the National Territory of La Pampa became an official province of Argentina, under the name of "Eva Perón Province". The 1951 constituent assembly, which wrote and adopted the first constitution of Eva Perón Province, mandated the election of a provincial Chamber of Representatives, with 21 members elected in single-member constituencies which were designed especially for the legislative body. The chamber convened for the first time on 4 June 1953, in the municipal building of Santa Rosa.[3]