Malaysia is formed from the Federation of Malaya, Singapore, North Borneo (Sabah) and Sarawak. However, Singapore is soon expelled from this new country.

Malaysia is a country in Southeast Asia. A federal constitutional monarchy, it consists of 13 states and three federal territories, separated by the South China Sea into two regions: Peninsular Malaysia on the Indochinese Peninsula and East Malaysia on the island of Borneo. Peninsular Malaysia shares land and maritime borders with Thailand, as well as maritime borders with Singapore, Vietnam, and Indonesia; East Malaysia shares land borders with Brunei and Indonesia, and a maritime border with the Philippines and Vietnam. Kuala Lumpur is the country's national capital, largest city, and the seat of the legislative branch of the federal government, while Putrajaya is the federal administrative capital, representing the seat of both the executive branch and the judicial branch of the federal government. With a population of over 34 million, it is the world's 42nd-most populous country.

Malaya, officially the Federation of Malaya, was a country in Southeast Asia from 1948 to 1963. It succeeded the Malayan Union and, before that, British Malaya. It comprised eleven states – nine Malay states and two of the Straits Settlements, Penang and Malacca. It was established on 1 February 1948.

The Colony of Singapore was a Crown colony of the United Kingdom that encompassed what is modern-day Singapore from 1946 to 1959. During this period, Christmas Island, the Cocos (Keeling) Islands, and Labuan were also administered from Singapore. Singapore had previously been established as a British colony since 1824, and had been governed as part of the Straits Settlements since 1826. The colony was created when the Straits Settlements was dissolved shortly after the Japanese occupation of Singapore ended in 1945. The power of the British Government was vested in the governor of Singapore. The colony eventually gained partial internal self-governance in 1955, and lasted until the establishment of the State of Singapore in 1958, with full internal self-governance granted in 1959.