There has traditionally been a correlation with political affiliation and religion. Democratic change has meant that the Catholic population in the North is due to overtake the Protestant population in 2017. In 2023 there should be a Catholic electorate majority (or plurality). The strategy is that as demographic change takes place and the Catholic population grows, so too will the Nationalist vote. Once the Nationalist vote has overtaken the Unionist vote a referendum on Irish Unity would be triggered. This would result in the reunification of Ireland.
This strategy is currently in tatters and Nationalism is in crisis. Why has the Nationalist vote collapsed?
People Before Profit received 2% of the vote and took two seats. PBP are an All Ireland Party and say they oppose the border yet they will not designate as Nationalist as they see themselves primarily as Socialists. A motion on the border needs to be put in the early days of the Assembly to test them on this. Even if we say the Nationalist vote was 38% this is still a miserable return.
Apathy again is the real problem. Many Nationalists no longer vote for SF or the SDLP because of a perceived liberal view on social issues such as abortion and same sex marriage. Many don't vote because they believe that partaking in the Northern Assembly is akin to administering of British rule in Ireland. Most though it seems don't vote because they simply don't give a shit!