What are some understandings of a nation?

I am going to first start with explaining what are the understandings of a nation. the understandings of a nation are sort of like the categories that a nation can be classified into. there are linguistic, religous, geographic, ethinic, cultural, and political understandings of a nation and for anyone who dosen't know what the meaning of a nation is. A nation is a group of people who share similarties and cultures. What i am trying to get at is that the understandings are sort of like the similarties that people share. for example say a isolated country was suddenly intoduced to the rest of the world. most likely these people will not seperate from each other and go and try to lern about the outside world individually they would stick together because they know each other and they each share similiar beliefs and cultures. Without even knowing it those people have formed a nation because they share the same understandings of a nation.

In the picture that hopefully was able to load onto my blog I posted a picture of a catholic church to show another example of a nation. This specific nation shares a religous understanding.