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Northern Ireland Constitution Act 1973

Act of the Parliament of the United Kingdom

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"Status of Northern Ireland as part of United Kingdom"

When the Republic of Ireland ceased to be a member of the British Commonwealth, Westminster had responded with the Ireland Act 1949 (12, 13 & 14 Geo. 6. c. 41). Amongst its other provisions, the act had guaranteed that Northern Ireland would not cease to remain a part of the United Kingdom "without the consent of the Parliament of Northern Ireland" (s. 1(2)); this declaration had proven to be controversial both with the Irish government and with Northern Ireland's nationalist community.

Since the 1973 act abolished the Parliament of Northern Ireland, it replaced the 1949 guarantee with one based on a popular vote rather than a parliamentary vote:

It is hereby declared that Northern Ireland remains part of Her Majesty's dominions and of the United Kingdom, and it is hereby affirmed that in no event will Northern Ireland or any part of it cease to be part of Her Majesty's dominions and of the United Kingdom without the consent of the majority of the people of Northern Ireland voting in a poll held for the purposes of this section in accordance with Schedule 1 to this Act. — Northern Ireland Constitution Act 1973, section 1.

A referendum on similar lines had already been held on 8 March 1973, with 98.9% of voters backing the union after a nationalist boycott of the poll. Schedule 1 of the Constitution Act provided that no further referendum was to be held before 9 March 1983. If the result of that or any future referendum meant that Northern Ireland remained part of the United Kingdom, a subsequent referendum on the issue could not be held for a further ten years.

The Northern Ireland Act 1998 replaced the 1973 referendum requirement, requiring a referendum if it "appears likely" to pass and unity negotiations if it does pass, and reducing the gap between referendums to seven years.

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