During the Spanish rule, the territorial jurisdiction of the province of Nueva Ecija extended to as far south at Cabiao and the towns of San Quintin, Rosales, Balungao and (H)umingan in the north, which later on formed part of the province of Pangasinan.
In 1898, soon after the Treaty of Paris (1898) was signed and the payment of 20 million pesetas for the possession of the Philippines, the United States Military Government (USMG) issued General Order No. 43 proclaiming the establishment of municipal governments.