8470 and its subsequent ratification by plebiscite on 7 March 1998 separated from Davao del Norte's first and second districts a total of eleven municipalities to create the new province of Compostela Valley (now named Davao de Oro), which itself was apportioned into two new congressional districts.
The passage of Republic Act No. 8470, ratified by plebiscite on March 7, 1998, separated eleven municipalities from Davao del Norte's first and second districts to form the new province of Compostela Valley (now known as Davao de Oro), which was then divided into two new congressional districts.