evidence: The history of Uganda comprises the history of the people who inhabited the territory of present-day Uganda before the establishment of the Republic of Uganda, and the history of that country once it was established. Evidence from the Paleolithic era shows humans have inhabited Uganda for at least 50,000 years. The forests of Uganda were gradually cleared for agriculture by people who probably spoke Central Sudanic languages. The Empire of Kitara grew out of the Urewe culture in the 10th century. Following the migration and invasion of Luo peoples c. 15th century, Kitara would collapse, and from the ashes rose various Biito kingdoms such as Bunyoro alongside Buganda.[citation needed] [...] Obote was overthrown on 27 July 1985, when an army brigade, composed mostly of ethnic Acholi troops and commanded by Lt. Gen. Bazilio Olara-Okello, took Kampala and proclaimed a military government. Obote fled to exile in Zambia. The new regime, headed by former defense force commander Gen. Tito Okello (no relation to Lt. Gen. Olara-Okello), opened negotiations with Museveni's insurgent forces and pledged to improve respect for human rights, end tribal rivalry, and conduct free and fair elections. In the meantime, massive human rights violations continued as the Okello government carried out a brutal counter-insurgency in an attempt to destroy the NRA's support. [...] In 1996, Uganda was a key supporter of the overthrow of Zairean President Mobutu Sese Seko in the First Congo War in favor of rebel leader Laurent-Désiré Kabila.