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The Autonomous Region in Muslim Mindanao (ARMM) was the only autonomous region in the Philippines, until it was superseded by Bangsamoro; as such it is the sole region with a regional government as prescribed by the Constitution of the Philippines.[1] In 2001, Republic Act No. 9054 was passed for the expansion of the region by including the areas which initially rejected inclusion and the provinces which were carved from them. However, only the city of Marawi and the province of Basilan, with the exception of Isabela, opted to be integrated in the region.
A special plebiscite was set on August 14, 2001.