Genocide. And somebody willing to nation build it away. That's the level of failure it takes.
Also it make no sense to claim that a centuries gone country borders would have any impact on deciding how the country is ruled in the future. The Nuremberg Trials and subsequently UN Charter has declared War for territorial gain is beneath the civilized nations of the world, and it would be in violation of international law for a country to pursue it. This would suggest that the result of such an intervention must be the rebuilding of the invaded state, much like in iraq, and not joining it to the invading country.
Also it make no sense to claim that a centuries gone country borders would have any impact on deciding how the country is ruled in the future. The Nuremberg Trials and subsequently UN Charter has declared War for territorial gain is beneath the civilized nations of the world, and it would be in violation of international law for a country to pursue it. This would suggest that the result of such an intervention must be the rebuilding of the invaded state, much like in iraq, and not joining it to the invading country.