A 1826 Singapore ta haɗu da Kamfanin Indiya na Gabas ta Gabas tare da Penang da Malacca don samar da Settlements na Straits, wanda Kamfanin Indiya na Gabas ta Gabas ke gudanarwa. A 1830, Settlements na Straits ya zama zama babban zama, ko reshen, na Bengal na Birtaniya a Indiya ta Indiya. A cikin shekarun da suka biyo baya, Singapore ta fito da sauri a matsayin muhimmin tashar kasuwanci, Birtaniya ta ƙarfafa da'awarta a kan tsibirin. Yarjejeniyar Anglo-Dutch ta 1824 ta tabbatar da matsayin Singapore a matsayin mallakar Birtaniya, ta rarraba tsibirin Malay a tsakanin kasashe biyu na mulkin mallaka tare da yankin arewacin Straits of Malacca, ciki har da Singapore, da ke ƙarƙashin tasirin Birtaniya. A shekara ta 1869, Singapore ta haɗu da Kamfanin Birtaniya na Gabas ta Gabas tare da Penang da Malacca don samar da Ƙungiyoyin Kasuwanci na Straits, wanda Kamfanin Birtaniya na Gabas ta Gabas ke gudanarwa.
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