What do the conflicts in xinjiang, chechnya, and quebec have in common, and how do they differ?

The common of the three would be the language. These three ethnic groups had struggled regarding language.  They did not use the language that is being used by the dominant groups. However, they differ in terms on how they cope with the changes. For the Xianjing, violence occurred because the Uighur were forced to assimilate with the Chinese during the Han dynasty. They tried to fight it at first, but they were outnumbered.
Quebec had allowed the French to be their official language to avoid bigger conflict between their colonizers.
While Chechnya had been the most violent one. The Chechens had waged war against the Russians. At first, they were able to win, however they had lose during the second war when the Russians were able to control Chechnya.