I think it has always worked throughout history, if you want to take over the land you face a potential problem from the inhabitants, usually a violent insurgency. As a result these people are hard to deal with as they hide amongst the general population, and as such there's only two proven ways to deal with them. 1) kill all the population (or at least start to, thereby putting the proverbial fear of god into them). 2) remove that population so they are out of their comfort zone.
You resettle your people, let simmer for a decade of two then the next generation say they have a claim as its there homeland as they where born there. I believe the Chinese are or where importing not insignificant amounts of Han Chinese into that little country, opps ex country called Tibet.
Its not nice but has always seemed to work
