Humans evolved to send and receive signals that enable us to recognize people we can trust. One of the most powerful signals is that the person speaks our language. If someone can speak like a native, then almost always he or she is a native, and natives tend to treat each other better than they treat strangers. In politics, I claim that progressives, conservatives, and libertarians are like tribes speaking different languages. The language that resonates with one tribe does not connect with the others. As a result, political discussions do not lead to agreement. Instead, most political
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