Commonwealth Act #441, An Act Creating the National Land Settlement Administration (NLSA) was approved by Congress and opened three major resettlement areas in the country: Mallig Plains in Isabela, and two in Cotabato, namely, Koronadal Valley made up of Lagao, Tupi, Marbel and Polomolok and Ala (now spelled Allah) Valley consisting of Banga, Norallah and Surallah

Source: https://www.mindanews.com/mindaviews/2020/12/angay-angay-lang-the-minoritization-of-the-indigenous-communities-of-mindanaw-and-sulu-6/