A significant number of construction projects in British East Africa and South Africa, required vast quantities of labor, exceeding the availability or willingness of local tribesmen. Indentured coolies from India were imported, for such projects as the Uganda Railway, as farm labor, and as miners. They and their descendants formed a significant portion of the population and economy of Kenya and Uganda, although not without engendering resentment from others. Idi Amin's expulsion of the "Asians" from Uganda in 1972 was an expulsion of Indo-Africans.