Rep. Ronaldo Zamora sponsored a House Bill which eventually became Republic Act No. 7675 otherwise known as "An Act Converting the Municipality of Mandaluyong into a Highly Urbanized City to be known as the City of Mandaluyong." President Fidel V. Ramos signed R.A. No. 7675 into law on 9 February 1994 (the 49th anniversary of its liberation from the Japanese), which was ratified through a plebiscite on 10 April 1994 making Mandaluyong the 5th city in Metro Manila. Mandaluyong became a lone district with its own Representative in Congress. Prior to the enactment of the assailed statute, the municipalities of Mandaluyong and San Juan belonged to only one legislative district.