In the first half of the 20th century, Sudan, which included the territories of present-day Sudan and South Sudan, was ruled by a dual colonial government known as the Anglo-Egyptian Condominium (1899–1956). Britain was the senior partner in this administration, Egypt being itself politically and militarily subordinated to Britain between 1882 and 1956. During most of the colonial period, Sudan was ruled as two Sudans, as the British sought to separate the predominantly Islamic and Arabic-speaking North from the multireligious and multilingual South. Educational policy was no exception to this: until 1947, the British developed a government school system in the North while leaving educational matters in the hands of Christian missionaries in the South. In the North, the numerically dominant government school network coexisted with Egyptian schools, missionary schools, community schools, and Sudanese private schools. In the South, schools were established by the Anglican Church Missionary Society, the Roman Catholic Verona Fathers, and the American Presbyterian Mission. Whereas Arabic and English were the mediums of instruction in Northern schools, the linguistic situation was more complicated in the South, where local vernaculars, English and Romanized Arabic were used in missionary schools. The last colonial decade (1947–1957) witnessed a triple process of educational expansion, unification, and nationalization. Mounting Anglo-Egyptian rivalries over the control of Sudan and the polarization of Sudanese nationalists into “pro-British” independentists and “pro-Egyptian” unionists led the British authorities in Khartoum to boost government education while giving up the policy of separate rule between North and South. In practice, educational unification of the two Sudanese regions meant the alignment of Southern curricula on Northern programs and the introduction of Arabic into Southern schools, first as a subject matter, then as a medium of instruction. Missionary and other private schools were nationalized one year after Sudan gained independence from Britain and Egypt (1956).