A nation is a peculiar sort of community that is easy to describe but hard to define. We can describe many specific nations founded on the basis of common cultural, historical and political institutions like a shared religion, language, ethnicity, history or regional culture. But it is hard to come up with any defining features, any characteristics that a nation must possess. For every possible criterion there are exceptions and counter-examples. For example, there are many nations that do not share a single common language, religion, ethnicity and so on. On the other hand, there are many languages, religions or ethnicities that are shared across nations. But this does not lead to the formation of a single unified nation of, say, all English speakers or of all Buddhists.
