How might nationalism and racism be interconnected?

Extreme nationalism is close to racial segregation.

Explanation:

We have seen this example several times throughout history. The most obvious example is in Nazi Germany, where various aspects of extreme nationalism were intertwined. Nazi ideology emphasized the superiority of the German nation, which we can identify with extreme nationalism. On the other hand, they noted that Jews, Roma, and Negroes are a lower race and that they should be destroyed. So in this example, we can see a direct link between nationalism and racism.

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social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live