They only become a serious threat to national solidarity when they combine within a single social welfare state that pits various ethnic groups against one another in the pursuit of their share of the productive pie. Even the Us has moved in that dangerous direction. When Cultural differences are to pronounced, integration becomes impossible. That is why it is better for many cultures to stay relatively separate and homogenous. Studies have shown a base culture can absorb up to 10 percent of another diverging culture without to much conflict, but when the invading culture begins to compete for dominance and majority rule, conflict is certain and violent. Look at Palestine, the Balkans and Europe.
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