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Throughout its history, the term "Uyghur" has had an increasingly expansive definition. Initially signifying only a small coalition of Tiele tribes in Northern China, Mongolia and the Altai Mountains, it later denoted citizenship in the Uyghur Khaganate. Finally, it was expanded into an ethnicity whose ancestry originates with the fall of the Uyghur Khaganate in the year 842, causing Uyghur migration from Mongolia into the Tarim Basin.