Since 2014, China has detained approx 1.5M Uighur Muslims, forcing them to learn Mandarin, renounce their faith and pledge loyalty to the Chinese government.
THIS documentary is eye-opening. But be aware, it's disturbing.
Some articles you may find useful that relate to this post:
A Uighurs’ History of China
History of the Uyghur people
The history of China's Muslims and what's behind their persecution
China Is Treating Islam Like a Mental Illness