Should there be a united Ireland?

Ireland is one nation and should be one sovereign state

Question: Should there be a united Ireland?
Position1 of 4›: Yes, Ireland should be united
Argument‹3 of 7›: Ireland is one nation and should be one sovereign state

The people of Ireland are one nation and so Ireland should be united

The argument

Irish culture is distinct from British culture. The people of Northern Ireland and the Republic of Ireland are culturally identical. They share the Irish language and share phrases within the English language. If sovereign states are determined by national, ethnic and cultural groups, then Ireland should be united as a single sovereign state due to its shared culture.

Context

The people of Ireland are one group with a shared culture and history that is clearly distinct from Britain's

Premises

[P1]The people of Northern Ireland and the Republic are culturally identical — sharing the Irish language and idiom — and distinct from British culture. [P2] If sovereign states are properly determined by national, ethnic and cultural groups, then a single shared culture warrants a single state. [C] Because Ireland is one nation, it should be one sovereign state — Ireland should be united.

Counter-arguments

Northern Irish unionists are a distinct cultural group. They do not speak Irish, they do not partake in most parts of Irish culture and they have a strong culture of their own with its own traditions and linguistic dialect. As a result, Ireland's people are not one nation and are in fact two.

Rejecting the premises

[Rejecting P2] Northern Irish Unionist do not share a culture with Irish Republicans. Therefore, they should be distinct sovereign territories.