Point Of View: Are we different because of mentality?

Today you will be a part of a curious discussion. Why people are so different and so similar sometimes? What is mentality? Why can people from different countries misunderstand each other? Why do we use the cliches: "europeans", "asians", "Italians", "Russians", "Spanish", etc. Sometimes we do something just automatically and others are not ready to accept it. But different nations have different sets of human worldview, points of view, assessments, values, behavioral norms, moral guidelines, mindsets, religious views and other aspects. Let's sort out what mentality is and which features are typical for different kinds of mentality.