Malaysia–Singapore border territories when Johor became a British protectorate while Singapore remained a British crown colony. On 31 August 1957, the Federation of Malaya (which consisted of only Peninsular Malaysia), which included Johor as a component state, became independent and the Johor–Singapore border again became an international boundary between the sovereign state of Malaya and the self-governing British territory of Singapore. On 16 September 1963, Singapore merged with and become a component state of the Federation of Malaysia, rendering the border between two component states of Malaysia. The border again became an international border when Singapore chose to be separated from Malaysia
Federation of Malaya Independence Act 1957 Federation of Malaya Independence Act 1957 The Federation of Malaya Independence Act 1957 (1957 c. 60 5 and 6 Eliz 2) was an Act of Parliament in the United Kingdom. It came into operation on 31 July 1957. The Act made provisions for the nation of Federation of Malaya (formerly the Protected States of Johor, Kedah, Kelantan, Negeri Sembilan, Pahang, Perak, Perlis, Selangor, and Terengganu) and the Settlements of Penang and Malacca to gain an independent sovereign country within and become a member of the Commonwealth of Nations on 31 August 1957; prior to this, Federation of Malaya (formerly Malay