City of Cagayan de Oro. RA 537 June 16, 1950 Extended the area of Quezon City . RA 711 June 6, 1952 The province of Zamboanga is split into Zamboanga del Norte and Zamboanga del Sur . RA 1414 April 25, 1956 Separated Aklan from Capiz RA 2141 April 8, 1959