Though the early growth in Botswana relied on meat exports, things changed dramatically when diamonds were discovered. The management of natural resources in Botswana also differed markedly from that in other African nations. During the colonial period, the Tswana chiefs had attempted to block prospecting for minerals in Bechuanaland because they knew that if Europeans discovered precious metals or stones, their autonomy would be over. The first big diamond discovery was under Ngwato land, Seretse Khama's traditional homeland. Before the discovery was announced, Khama instigated a change in the law so that all subsoil mineral rights were vested in the nation, not the tribe. This ensured that diamond wealth would not create great inequities in Botswana. It also gave further impetus to the process of state centralization as diamond revenues could now be used for building a state bureaucracy and infrastructure and for investing in education. In Sierra Leone and many other sub-Saharan African nations, diamonds fueled conflict between different groups and helped to sustain civil wars, earning the label Blood Diamonds for the carnage brought about by the wars fought over their control. In Botswana, diamond revenues were managed for the good of the nation.