Because the Unionists that live in Northern Ireland are imports from the various plantations by Britain, and so, have no right to stop the Irish who have been in Ireland all along from being united

Because Northern Ireland had a strong population of British People from the plantations and the people of the Republic Of Ireland now a days were the main people fighting for freedom for 800 years

The Plantations.

it goes back HUNDREDS of years...look up a man called oliver cromwell and the plantations of Ireland something like the 1400AD

The pale was the part of Ireland that was directly under the control of the English government. It covered most of the county of Dublin and also parts of Kildare, Meath and Louth.