You forgot to mention that 40% of "Xinjiang" is Han Chinese. They are obviously not indigenous to the region. This is a deliberate policy to dilute the demographics of the region and to Sinicize it.
Wrong. Han Chinese was there long before Uighurs, who, being a nomadic people, moved there in around 10th century from Yenisei river region (Kazakhstan/Russia current border). At that time, this region belonged roughly to Western Liao and Western Xia kingdoms, which were Sinicized Mongolian and Tibetan respectively.
Just take a look at any historical books, including Wikipedia. Do not spread lie.
Xinjiang = new frontier/new border, that is correct. But that does not mean it is new to Han Chinese. It was new to Qing dynasty only. During Han (200 BC - 200AD)/Tang/Yuan dynasties, this area was under Chinese rule. But in 10th century, Song dynasty lost this land to outsiders, as mentioned above.
In Vietnam, there is also district with the same name (Tan Cuong district in Thai Nguyen (=Taiyuan in Chinese) province). However, that does not mean this district is new to Vietnamese.
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