Nationalism.. what is it

It is knows to everybody that nationalism is the love of the country.. its land, trees, streets etc..
Let's not talk about people who stick labels to their forehead and scream from the top of their longs demonstrating in national events.. no .. We'll be talking about the feeling you have when landing in the airport of your home town after being elsewhere, where it is much more comfortable, friendly and civilized place.

So where does it come from? would we agree that there are trees and water and land everywhere we go ? it is not the family.. that's a total different feeling .. So what is it ?

It is not difficult to remember why you left the country to begin with. mostly for better life out there in places, where you are treated with respect and just and on equal basis with others.
Logically you should love this place more and consider it home ..
Why is that not the case.. people go back with that landing in home town feeling to face the same issues that made them run away in the first place.
We can say, this applies to everybody with spectrum of scale. some miss to the extend of suffering , others miss it just when they have time.. and everybody is in between this 2 points.
Remains the question: why ? what makes the bad place, that you choose to run away from and live elsewhere, and you still remember why you hate it, why it is still "home"..
and why do people feel it with different degrees?
It might be something that we don't remember .. something that has to do with the time when we were pure human .. a white sheet ready to accept any and everything around as fact.. that happen once in life time and only to babies.. and gradually goes away as we grow.
Remember the time when everybody loved you for nothing ? Not because you are great or you did amazing things, helped them in their hard times , but just because you are there.. ?

We all have hard time loving people for nothing.. We think of a reason to love people in general. somehow we learned that with time. but there was a time when you were a baby. everybody protected you , loved you and for no reason or whatsoever.
This period could be short or long depending on the family situation, mentality and culture. you start then to "know" your personality and behave accordingly , things will change and you will be treated according to measures . that old feeling (love and beloved for nothing) is forgotten but hidden somewhere and covered with layers of troubles coming from living in the (Land of stupidity and arrogance).
The feeling come back when you are outside, you deal with matters as an adult, who learned to doubt and hate and be criticized, the feeling of (no more baby) discomfort is there all the time (more or less depending on place and person)..
The feeling of the ultimate purity and innocence, unconditional joy and love is dormant away from the consciousness .. it wakes up with the captains voice "Ladies and Gentlemen, we will be landing......)

That's Nationalism.