[quote=@catchamber]
<Snipped quote by ReonenMiruel>

Can you elaborate on this, and provide an example?
[/quote]

Control immigration to a point where people who want to assimilate, can, and people who don't, won't even want to enter. At the end of the day, I reckon I phrased that badly - but see above. Reduce the incentive for people to come when they don't have much to offer, but want to take advantage of certain things, and it'll happen naturally.