Choiseul Island Santa Isabel Island as the Ortega channel after the commander of the expedition. Choiseul islanders suffered attacks from blackbirding in the nineteenth century (the often brutal recruitment or kidnapping of labourers for the sugar plantations in Queensland and Fiji). In April 1885 a German Protectorate was declared over the North Solomon Islands, including Choiseul. In 1900, under the terms of Treaty of Berlin (14 November 1899), Germany transferred the North Solomon Islands (except for Bougainville and its surrounding islands) to the British Solomon Islands Protectorate in exchange for the British giving up all claims to Samoa. Missionaries settled on Choiseul
Malaita Kwaio and 'Are'are regions, which may be a dialect of Kwaio. Sa'a, spoken on South Malaita, is also a member of the family. Mutual intelligibility is also aided by the large degree of trade and intermarriage among the groups. The peoples of Malaita share many aspects of their culture, although they are generally divided into ethnic groups along linguistic lines. In pre-colonial times, settlements were small and moved frequently. Both agnatic descent (patrilineal lines from a founding ancestor) and cognatic descent (through links of outmarrying women) are important. These lineages determine rights of residence and land use in a complex