What are the major political parties in Ireland? What happened in Ireland's relations with Northern Ireland during the 1990s?

What are the major political parties in Ireland? What happened in Ireland's relations with Northern Ireland during the 1990s?

(1)The major political parties are Fianna Fail, Fine Gael, the Labor Party, and the Progressive Democrats.
(2) During the 1990s all major parties accepted the position within the United Kingdom of Northern Ireland. The Irish constitution was altered to acknowledge this fact in 1998, when voters overwhelmingly endorsed the Belfast Agreement, a peace plan signed by the Irish and British governments and nationalist and unionist political parties in Northern Ireland.