The British negotiated the island's dominion status with the leader of the State Council, D.S. Senanayake, during World War II. Senanayake was also minister of agriculture and vice chairman of the Board of Ministers. The negotiations ended with the Ceylon Independence Act of 1947, which formalized the transfer of power. Senanayake was the founder and leader of the United National Party (UNP), a partnership of many disparate groups formed during the Donoughmore period, including the Ceylon National Congress, the Sinhala Maha Sabha, and the Muslim League. The UNP easily won the 1947 elections, challenged only by a collection of small, primarily leftist parties. On February 4, 1948, when the new constitution went into effect (making Sri Lanka a dominion), the UNP embarked on a ten-year period of rule.

Data as of October 1988