Patriotism and nationalism are almost interchangeable terms. Nationalism is defined as “the policy or doctrine of asserting the interests of one’s own nation viewed as separate from the interests of other nations".
Seeing as a multicultural society is comprised of people originating from foreign nation states their loyalty couldn't be counted upon as it would be divided between their host nation and their motherland. You can't reasonably depend on people to act against the interests of their homeland where they'd most likely still have a connection to the land. It creates a conflict of interest.
There's also the component of race and culture. Culture is the product of race. Race came before culture. It's our genes that mostly make us who we are. That's called biological determinism and it's what culture is generated from, at least to a large degree. What I'm getting at is this. A nation is defined by the way its people want to live. The way a people want to live is defined by their culture. The way we define culture is through race. If you mix and match too many races it'll eventually result in dysfunction as the different racial demographics will want to live their own way. It results in fractured and bulkinized nations where each group competes for their own interests and way of life.
The more genetically homogeneous a society is the more culturally homogenized it will be. Cultural unification is predicated on race.
When you mix everybody up we all have to fallback on the most basic cultural common denominators and it really dumbs down the common culture as well.
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