Those Uyghur workers are usually seen selling foods on the streets throughout China, or dwelling in their illegal cellar mosques, but thanks to extensive government programs to eradicate radicalism and poverty, Uyghurs are increasingly seen in textile production and other sorts of manufacturing, mainly in Xinjiang. Not in cotton, though, as that industry is nearly fully automated, but maybe soon in rare earth production? Come again, you want to boycott rare earths??
Anyway, the reason Apple has manufacturing in China has little to do with low wages, and the more to do with the Chinese ability to set up and automate production lines, the logistics and infrastructure, ample supply of skilled workers, that is all the stuff that is lacking in both India and the US.
So you couldn't bring the jobs back to America, because you don't have the facilities, you don't have the skilled workforce, you don't have the supply chain of electronics components that are available in Shenzhen, you don't even have the assembly work force needed to assemble those phones.
India less so.