Umvolkung

Noun

 * 1)  a policy that aims at radically changing the demographic composition of a population, through immigration and influencing reproductive behaviour

Usage notes

 * The word is most often used to refer to the growth of allochthone communities in post-war Germany and western Europe, which is thereby labelled a deliberate strategy to weaken the autochthone populations. The word was originally restricted to the radical right, but is now seeing some usage among right-wing conservatives.