/ Is it good for Poland as Sinn Fein will win today in Northen Ireland
The problem is not simplicity but complexity.
You haven't learn anything. Ireland is not an exception and it has nothing to do with reading about Irish history. There is that general pattern when it comes to the creation of the modern nationalism and that pattern is the same or close enough to the pattern that spread across Europe. History is rewriten and reshaped often enought. It can't be seen as a holy writ.
In fact your last sentence is a proof that you don't understand what I'm talking about. It is better to ask questions rather then preach. If you want to know ask questions if you don't want to know - stop posting unrelated stuff.
Ireland was a distinct country.
Oh, so other nations didn't? What are you trying to say? What you saying is in fact copyright of the pattern of the modern nationalists - about continuity of people, nations, cultures and so on. It is it stable diet. What you say is what is being said for the last 200 years it doesn't mean that much. I don't say it is worng but it is not the whole truth.
It is a question of perspective, if you want to see and find something you will find it, some items and facts are blown out of the proportion or their meaning distorted by an interpretation, other that would contradict certain narrative are either left out out or it signifance diminished.
I'm not saying those all are fairly stories but you need to be careful what you read into it. The way people had seen themsleves in the past often is overlooked and read in the same way they see themselves at the present. Which is an incorrect perspective.