Head of state second and last incumbent of the office, Yusof bin Ishak, kept the style at 31 August 1963 unilateral declaration of independence and after 16 September 1963 accession to Malaysia as a state (so now as a constituent part of the federation, a non-sovereign level). After its expulsion from Malaysia on 9 August 1965, Singapore became a sovereign Commonwealth republic and installed Yusof bin Ishak as its first President. In 1959 after the resignation of Vice President of Indonesia Mohammad Hatta, President Sukarno abolished the position and title of vice president, assuming the positions of Prime Minister and Head of Cabinet.
North Borneo Self-government Day North Borneo Self-government Day North Borneo Self-government Day is a self-government day celebrated on 31 August every year by the state of Sabah in Malaysia. Since 2012, the holiday has been received widely by the Sabah state government and the citizens of Sabah, as the Hari Merdeka was not the right celebration day for the state. While North Borneo Self-government Day is often referred to as 'Independence Day', this is strictly speaking incorrect, since British legislation on North Borneo's self-government did not provide for its independence prior to it joining to form the federation of Malaysia. In 2018, the Borneo