"It is not a question of whether, but when and how Ireland will be united", is the provocative opening argument made by author and journalist Frank Connolly in his recent book United Nation: The Case for Integrating Ireland. But he concedes it won't be easy.

The book explores the steps that would be necessary in advance of a border poll and the changes that unity would bring, North and South. He talked to Hugh Linehan about his book recently.

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