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In page Raj of Sarawak:

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In 1869, by which time total trade had reached $3,262,500,[18] the second Rajah invited Chinese black pepper and gambier growers from Singapore to cultivate their crops in Sarawak.[19][20] As a result, by the early 20th century, Sarawak became one of the world's major producers of pepper.[21] The kingdom was a relative latecomer to the natural rubber boom due to the reluctance of the second Rajah to give over indigenous farmland to European companies.[22] Only five large rubber estates were established during his reign.[12] Oil reserves were discovered in his final years.[23] From the 1930s, through the work of the Chinese businesses in the kingdom, it became a significant raw material supplier, with Singapore a major trading partner.[24][25]