The eruption of Mount Pinatubo forced the leadership of the U.S. to prematurely abandon its military installation at Clark Air Base. This is in addition to the voting by the Philippine Senate in 1991 to no longer extend the Laurel-Langley Agreement, which allowed the presence of U.S. military forces on Philippine territory, thus ending the long chapter of Filipino-American relations in the history of Angeles. The U.S. military never returned to Clark, turning over the damaged base to the Philippine government on 26 November 1991