What fundamental law of the Republic of Ireland allowed athletes who participated with Great Britain in the 1976 Winter Paralympics to later elect to hold Irish citizenship?
Great Britain at the 1976 Winter Paralympics:  The team was made up of athletes from the whole United Kingdom; athletes from Northern Ireland, who could later elect to hold Irish citizenship under the pre-1999 article 2 of the Irish constitution, were only eligible to represent Great Britain at this time. Constitution of Ireland: The Constitution of Ireland (Irish: "Bunreacht na hÉireann" , ] ) is the fundamental law of the Republic of Ireland.
Constitution of Ireland