Final answer:
Nathan's viewpoint of his own culture as inherently superior to others can be described as ethnocentrism, a biased perspective where one's own culture is the benchmark for evaluating other cultures.
Step-by-step explanation:
Nathan's viewpoint, without further context, cannot be directly determined from the options provided (ethnocentrism, cultural relativism, multiculturalism, social cohesion). However, from the provided reference information, we can infer that if Nathan believes that his own culture is inherently superior to other cultures, then his viewpoint would best be described as ethnocentrism. Ethnocentrism is a concept where one evaluates and judges other cultures based on their own cultural norms and standards, which is indicative of a belief that their culture is the correct one. Instances of ethnocentrism include Americans believing that people from England drive on the 'wrong' side of the road, or finding it odd to see a pet dog in a French restaurant. Ethnocentrism is essentially a perspective wherein one's own culture is seen as the benchmark against which all other cultures are assessed. This perspective can often lead to misunderstandings and negative judgments about other ways of life.
If Nathan's viewpoint is that his own culture is superior, the final answer in two line explanation in 300 words would be that Nathan's perspective is ethnocentric, a view that regards one's own culture as the standard and often misjudges other cultures as inferior.