Data from：
http://all.talkmalaysia.com/selangor/selangor-history/

Selangor History

In the late 15th-century Selangor fell under the dominion of the Malacca Sultanate. In 1680 Selangor experienced mass immigration by Bugis trying to escape Dutch control in their home island of Macassar. Eventually, the number of Bugis superseded the original Minangkabau population. By the 18th century, the Bugis had consolidated their control of Selangor and in 1740 established the present Sultanate, with the capital at Kuala Selangor.

An influx of Chinese tin miners occurred in the 19th century, bringing with them their community traditions and social structure, most notably the secret society establishment. Similar to Perak, rival factions split the Selangor Chinese community. The situation became tense as the established power structure was disrupted by the emergence of various petty tin chiefs. However, the Chinese rivalry did not erupt to full-scale fighting until a Malay war over royal succession broke out in 1870. The tin trade came to a standstill. This led to British intervention in 1874. J.G. Davidson was installed as the first British Resident.

Selangor became a Federated Malay State in 1896. The British Military Administration took over the state following the end of the Japanese Occupation.

British colonialists in London formed the Malayan Peninsula Planning Unit in 1943, and on 10 October 1945, the Malayan Union scheme was laid out before the British Parliament. A day later, Sir Harold MacMichael was sent to the Malayan Peninsula to obtain the agreement of the Malay Rulers. According to this agreement, Penang, Malacca and 9 other Malay states were united under the Malayan Union.

Malay opposition groups derailed the Malayan Union plan, and the United Malays National Organisation (UMNO) was formed under Dato’ Onn Jaafar’s leadership on 11 May 1946. The Malay Federation was founded on 1 February 1948 and on 31 August 1957, independence was declared.