Uighurs are also Chinese, if so, why Uighurs can be exempt from China's one child policy for decadesBut not Han Chinese
because this
"the one child policy happens at the time when Chinese Han are reproducing at a higher rate than the state could economically sustain them.
the Uyghur drop in birth rate happens when China is in a period of booming and rapidly expand economy and standard of life. there's simply no denying this."