Prospect of Irish reunification

In 1973, Northern Ireland had a referendum on Irish reunification, though the result was in favour of the United Kingdom and the poll was boycotted by Nationalists. The 1998 Northern Ireland Good Friday Agreement referendum was then held to approve the Good Friday Agreement, which among other things, included a clause which states that a border poll on Irish reunification must be held if public opinion is shown to have changed in favour of a United Ireland.