Few Indians settled on Tobago however, and the descendants of African slaves continued to form the majority of the island's population. An ongoing economic slump in the middle-to-late 19th century caused widespread poverty. Discontent erupted into rioting on the Roxborough plantation in 1876, in an event known as the Belmanna Uprising after a policeman who was killed. The British eventually managed to restore control, however as a result of the disturbances Tobago's Legislative Assembly voted to dissolve itself and the island became a Crown colony in 1877. With the sugar industry in a state of near-collapse and the island no longer profitable, the British attached Tobago to their Trinidad colony in 1889.