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Although Marcos was elected to a second term as president in 1969--the first president of the independent Philippines to gain a second term--the atmosphere of optimism that characterized his first years in power was largely dissipated. Economic growth slowed. Ordinary Filipinos, especially in urban areas, noted a deteriorating quality of life reflected in spiraling crime rates and random violence. Communist insurgency, particularly the activity of the Huks--had degenerated into gangsterism during the late 1950s, but the Communist Party of the Philippines-Marxist Leninist, usually referred to as the CPP, was "reestablished" in 1968 along Maoist lines in Tarlac Province north of Manila, leaving only a small remnant of the orgiinal PKP. The CPP's military arm, the New People's Army (NPA), soon spread from Tarlac to other parts of the archipelago. On Mindanao and in the Sulu Archipelago, violence between Muslims and Christians, the latter often recent government-sponsored immigrants from the north, was on the rise. In 1969 the Moro National Liberation Front (MNLF) was organized on Malaysian soil. The MNLF conducted an insurrection supported by Malaysia and certain Islamic states in the Middle East, including Libya.
The carefully crafted "Camelot" atmosphere of Marcos's first inauguration, in which he cast himself in the role of John F. Kennedy with Imelda as his Jackie, gave way in 1970 to general dissatisfaction with what had been one of the most dishonest elections in Philippine history and fears that Marcos might engineer change in the 1935 constitution to maintain himself in power. On January 30, 1970, the "Battle of Mendiola," named after a street in front of the Malacañang Palace, the presidential mansion, pitted student demonstrators, who tried to storm the palace, against riot police and resulted in many injuries.
Random bombings, officially attributed to communists but probably set by government agents provocateurs, occurred in Manila and other large cities. Most of these only destroyed property, but grenade explosions in the Plaza Miranda in Manila during an opposition Liberal Party rally on August 21, 1971, killed 9 people and wounded 100 (8 of the wounded were Liberal Party candidates for the Senate). Although it has never been conclusively shown who was responsible for the bombing, Marcos blamed leftists and suspended habeas corpus--a prelude to martial law. But evidence subsequently pointed, again, to government involvement.
Government and opposition political leaders agreed that the country's constitution, American-authored during the colonial period, should be replaced by a new document to serve as the basis for thorough-going reform of the political system. In 1967 a bill was passed providing for a constitutional convention, and three years later, delegates to the convention were elected. It first met in June 1971.
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http://workmall.com/wfb2001/philippines/philippines_history_marcos_and_the_road_to_martial_law_1965_72.html