Sirimavo Bandaranaike came to office as the world's first Woman Prime Minister in May 1970. Her United Front Government used the parliament as a Constituent Assembly and drafted a new Republican Constitution. It was promulgated on 22 May 1972. This Constitution provided for a unicameral legislature named the National State Assembly with a term of office of 6 years and Sovereignty was entirely vested in it. A nominal President with a term of office of 4 years was appointed as the Head of State by the Prime Minister, Head of the Cabinet of Ministers responsible to the National State assembly. Ceylon was replaced by republic of Sri Lanka (Resplendent Island). this constitution contained a declaration of fundamental rights and freedom was amended on 11 February 1975 to change the basis of delimitation of constituencies from 75,000 persons per electorate to 90,000 persons. J. R. Jayewardene who came to office in July 1977 with a five-sixths majority passed the second amendment to the 1972 Constitution on 4 October 1977, which made the presidency an executive post. Under its provisions,then Prime Minister Jayawardene automatically became the first Executive President of Sri Lanka on 4 February 1978.