The Moro Nuba are a sub-ethnic group of the Nuba peoples in the Nuba Mountains of South Kordofan state, in southern Sudan. Many members of this ethnicity are Christians. The population of this ethnicity possibly does not exceed 100,000. Land Down-migration Until the early 1940s, all of the Moro Nuba resided on the tops of mountains in the Nuba Mountains, similar to many other Nuba peoples. Various Nuba ethnic groups, including the Moro, were driven up to higher elevations because of tribal wars, wandering nomads, government slave raids, and attacks from Sudanese forces during the Mahdist War. Specifically, the Moro sought protection in the hills from slave traders. After Sudan came under Anglo-Egyptian rule, the Moro began to migrate downwards into the surrounding plains of the Nuba Hills. A strong government under Condominium rule meant that intertribal wars were much more infrequent, and also ceasing previous government attacks on Nuba peoples. The Moro also migrated downwards because of population growth and a lack of farmable land. Additionally, a yellow fever epidemic in 1940 caused the Moro to burn their farms in attempts to rid their villages of the disease, which in turn destroyed their farmland and forced them to migrate downward. Down-migration of the Moro into surrounding plains allowed for them to engage in agriculture, especially cotton which had developed into a cash crop of Sudan. They also grow maize, sorghum, groundnuts, gourds, okra, horse beans, and sesame, all of which are indigenous to them. Additionally, down-migration resulted in increased interaction between various clans of the Moro, and began attracting working-age males into mechanized agriculture from outside the hills. Land ownership The Moro do not have ownership over their land, despite being indigenous to it. A series of land registration acts starting in 1905 and culminating with the 1970 Unregistered Land Act, decreed that any land not registered to private owners was government property, including land in the Nuba Mountains and other previously excluded indigenous lands. As a result, the Moro are often forced to move away from their land to work in mechanized agriculture for other parties, in order to generate income. In addition, the Sudanese government has sponsored the immigration of Baggara and Jellaba ethnic groups into indigenous Moro lands, effectively pushing out the Moro from their farming lands. As a response, the Moro organized the Nuba Mountain Political Union, though success has been limited. Culture Modern Moro