File:Malaysia Act 1963.pdf The Malaysia Agreement or the Agreement relating to Malaysia between United Kingdom of Great Britain and Northern Ireland, Federation of Malaya, North Borneo, Sarawak and Singapore is the name used for the decolonization of North Borneo, Sarawak, and Singapore which it was union in 1963 with existing independent states of the Malaya as the states of Sabah, Sarawak and Singapore and the union was renamed Malaysia., then Singapore cease to be a state of Malaysia on 9 August 1965 become an independent state.

The Malayan Union was established by the British Malaya and comprised the Federated Malay States of Perak, Selangor, Negeri Sembilan, Pahang; the Unfederated Malay States of Kedah, Perlis, Kelantan, Terengganu, Johor; and the Straits Settlements of Penang and Malacca. It came into being in 1946, through a series of agreements between the United Kingdom and Malayan Union. The Malayan Union was superseded by the Federation of Malaya on 1 February 1948, and achieved independence within the Commonwealth of Nations on 31 August 1957.

Malaysia (ⁱ/məˈleɪʒə/ mə-LAY-zhə or ⁱ/məˈleɪsiə/ mə-LAY-see-ə) is a federal constitutional monarchy in Southeast Asia. It consists of thirteen states and three federal territories and has a total landmass of 329,847 square kilometres (127,350 sq mi) separated by the South China Sea into two similarly sized regions, Peninsular Malaysia and Malaysian Borneo. Land borders are shared with Thailand, Indonesia, and Brunei, and maritime borders exist with Singapore, Vietnam, and the Philippines. The capital city is Kuala Lumpur, while Putrajaya is the seat of the federal government. In 2010 the population exceeded 27.5 million, with over 20 million living on the Peninsula.

Malaysia has its origins in the Malay Kingdoms present in the area which, from the 18th century, became subject to the British Empire. The first British territories were known as the Straits Settlements, whose establishment was followed by the Malay kingdoms becoming British protectorates. The territories on Peninsular Malaysia were first unified as the Malayan Union in 1946. Malaya was restructured as the Federation of Malaya in 1948, and achieved independence on 31 August 1957. Malaya united with Sabah, Sarawak, and Singapore on 16 September 1963, with si being added to give the new country the name Malaysia. However, less than two years later in 1965, Singapore was expelled from the federation. Since independence, Malaysia has had one of the best economic records in Asia, with GDP growing an average 6.5% for almost 50 years. The economy has traditionally been fuelled by its natural resources, but is expanding in the sectors of science, tourism, commerce and medical tourism.