> Constant immigration is not sustainable. Especially when people come from cultures which are very different than the west. They have different value systems, religions, etc.

I lived in Northern Calfornia (Bay Area) for a few years. I would disagree with the quoted statement above. Yes, it was not perfect (ethnic) harmony, but there were absolutely wild(!) levels of immigration there -- all kinds of Asians (East, Southeast, and South) as well as Latins (Central and South America). Some how, some way, it worked; I guess because the economy was very strong. I would characterise most Latin cultures as _closer_ to Western European cultures because they are mostly Christian (though, some are Animist), so they have a Christian world view. However, East/Southeast/South Asians that immigrate to California are rarely Christian (some South Indians and South Koreas). Buddhists (so many types!), Confucianists/Daoists, Hindus, Moslems, Sikhs were are all present in the Asian immigrant community. For the first generation (the parents), they all stayed in very tight communities, but their kids learned to mix in public schools, unis, and early career jobs. I never got tired of hearing the funny stories when immigrant parents first learned that their children were dating outside their national/ethnic/religious group. At first, shock and disappointment, then later, acceptance.

Also, specifically regarding Germany, are you German, or have you lived there? Unfortunately, I see a lot of negative media about immigration in Germany ("Oh, too much! Cannot mix different types!" -- All that bullshit). But, then you talk to Germans, especially those under 40, and it is a different story. Many of them grew up with many immigrants in their schools. Germany is already much more multi-cultural than outsiders realise. The number of ethnic Turks in Germany would surprise many. In the last 20 years, this community has become much more integrated into wider Germany society. (They finally have some federal minister roles... whoot!) Yes, Germany has ethnic struggles, as any newly multi-cultural nation has, but, overall, they have a good attitude about it.