During the late-19th century, many Malay states decided to obtain British help in settling their internal conflicts. The commercial importance of tin mining in the Malay states to merchants in the Straits Settlements led to British government intervention in the tin-producing states in the Malay Peninsula. British gunboat diplomacy was employed to bring about a peaceful resolution to civil disturbances caused by Chinese and Malay gangsters, and the Pangkor Treaty of 1874 paved the way for the expansion of British influence in Malaya. By the turn of the 20th century, the states of Pahang, Selangor, Perak, and Negeri Sembilan, known together as the Federated Malay States (not to be confused with the Federation of Malaya), were under the de facto control of British Residents appointed to advise the Malay rulers. The British were "advisers" in name, but in reality they exercised substantial influence over the Malay rulers.
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