Economic and political developments in the 1970s affected various sections of the Lunda-Chokwe differently. Substantial numbers of them live in or near Lunda Norte Province, which contains the principal diamond mines of Angola. Diamond mining had been significant since 1920, and preindependence data show that the industry employed about 18,000 persons. Moreover, the mining company provided medical and educational facilities for its employees and their dependents, thereby affecting even greater numbers. How many of those employed were Lunda-Chokwe is not clear, although neighboring villages would have been affected by the presence of the mining complex in any case. In the intra-Angolan political conflict preceding and immediately following independence, there apparently was some division between the northern Lunda-Chokwe, especially those with some urban experience, who tended to support the MPLA, and the rural Chokwe, particularly those farther south, who tended to support UNITA. In the 1980s, as the UNITA insurgency intensified in the border areas of eastern and northern Angola, Lunda-Chokwe families were forced to flee into Zaire's Shaba Province, where many remained in 1988, living in three sites along the Benguela Railway. The impact of this move on the ethnolinguistic integrity of these people was not known.