[Ryzorian]

It's about assimulation. That's the crux of it. When a group of Immigrants come in, they must assimulate to the local population in order for things to go smoothly. When they don't, things get ugly.

In otherwords, if a bunch of folks moved to Japan, it would be expected that they would "become Japanese" in how they view the world. That's assimulation. Many of the problems in the US and Europe today is because they have let immigration run unchecked and hampered proper assimulation with "multicutural BS". Your American or your not, there is no Fillintheblank- American.

Large numbers of immigrants who don't conform or assimulate into a local population base is called an "invasion", or "colonization". It's exactly what happened to the American Indians. They were over run by sheer numbers of Immigrants who exspected the natives to conform to the immigrants way of thinking, not the other way around.

Bascially, in order to have a "happy" Intigration policy you only allow small numbers in at a time and they have to "go native". If they don't you send them back where they came from.