https://en.wikipedia.org/wiki/Good_Friday_Agreement#:~:text=Article%201%20(vi)%2C%20commonly,to%20hold%20both%20British%20and https://en.wikipedia.org/wiki/Good

https://en.wikipedia.org/wiki/Good_Friday_Agreement#:~:text=Article%201%20(vi)%2C%20commonly,to%20hold%20both%20British%20and https://en.wikipedia.org/wiki/Good_Friday_Agreement#:~:text=... >Article 1 (vi), commonly referred to as the birthright provisions, states that both governments, "Recognise the birthright of all the people of Northern Ireland to identify themselves and be accepted as Irish, or British, or both