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.

The Second Philippine Commission (the Taft Commission) acting as the upper house of a bicameral legislature then issued Act No.82 in 1901, “The 1901 municipal code” provided for popularly elected presidents (mayor), vice presidents (vice mayor), and councilors to serve on municipal boards.

It was only in 1913 that Lupao became a town mainly through the concerted efforts of Gen. Manuel Tinio and Assemblyman Isauro Gabaldon of the Philippine Assembly.

Its founding fathers were Victoriano Joanino, Calixto Laureta, Felix Carpio, Juan Briones, Anacleto Ganareal, Luis Mamaligsa, Gregorio Babagay, Sicto Baclig, Remigio Blas Caoile and Candido Mata.

The murders were carried out by the 14th Infantry after they failed to capture the NPA who had killed platoon leader Second Lieutenant Edgar Dizon, in an ambush the night before.

"[citation needed][6][7] On September 25, 2005, three NPA members were killed by soldiers of the 71st Infantry Battalion during a hot pursuit operation against the rebels in Barangay Cordero, Lupao.

This type of climate is typically hot, humid and tropical and is generally affected by the neighboring topography and the prevalent wind direction that varies within the year.

Poverty incidence of Lupao Source: Philippine Statistics Authority[13][14][15][16][17][18][19][20] Due to its history and cultural background, Lupaoenian cuisine is greatly influenced by the Ilocanos and Pangasinenses.

The locals are also fond of sweets like tinudok, espasol, puto, tambutambong, tupig, kalamay, ginataang bayabas and ingkiwar.