Yeah, well, maybe I over-hyperbolized, which I'm quick to criticize others about.

Anyway, it seems like there might be three models, actually. Leaving off assignments to specific countries, they are perhaps the following:

• Allow immigration, but don't encourage (or allow) integration.
  
• Encourage immigration, and expect virtually full integration and indoctrination after one generation.
  
• Invade your neighbor, and force him to obey your rules.

I was just pointing out that Rome and China used the latter model for a lot longer than any of our recent western methods.