Why is multiculturalism only forced in white countries?

Anonymous
Africa for Africans. Asia for Asians. White countries for everybody.

Why?

Many people say that if this continues we'll eventually all be dark-skinned and black haired - white people will be wiped out by race mixing and white people having less white children.

Recently on Twitter a labour MP Jack Straw when asked this question said that "the English as a race aren't worth saving". And yet for asking this question many of you probably see me as a racist, not him.

When animals are endangered people see it as a sad thing and try to preserve the species, yet for a white man to want to do the same is seen as racist by leftists. In fact I've seen leftists celebrate the fact that white people could be wiped out and encourage inter-racial dating.

So, why do you think this only happens in white countries?
Why is multiculturalism only forced in white countries?
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