The 1937 Constitution
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With regard to Northern Ireland, despite the irredentist nature and rhetorical claims of articles 2 and 3 of the new constitution, the compatibility of Irish citizenship law with the state’s boundaries remained unaltered.
Irish Nationality and Citizenship Act 1956
In 1956, the Irish parliament enacted the Irish Nationality and Citizenship Act 1956. This Act repealed the 1935 Act and remains, although heavily amended, the basis of Irish citizenship law. This act, according to Ó Caoindealbháin, altered radically the treatment of Northern Ireland residents in Irish citizenship law. With the enactment of the Republic of Ireland Act in 1948, and the subsequent passage of the Ireland Act by the British government in 1949, the state’s constitutional independence was assured, facilitating the resolution of the unsatisfactory position from an Irish nationalist perspective whereby births in Northern Ireland were assimilated to “foreign” births. The Irish government was explicit in its aim to amend this situation, seeking to extend citizenship as widely as possible to Northern Ireland, as well as to Irish emigrants and their descendants abroad.
The Act therefore provided for Irish citizenship for anyone born in the island of Ireland whether before or after independence. The only limitations to which were that anyone born in Northern Ireland was not automatically an Irish citizen but entitled to be an Irish citizen and, that a child of someone entitled to diplomatic immunity in the state would not become an Irish citizen. The Act also provided for open-ended citizenship by descent and for citizenship by registration for the wives (but not husbands) of Irish citizens.
The treatment of Northern Ireland residents in these sections had considerable significance for the state’s territorial boundaries, given that their “sensational effect … was to confer, in the eyes of Irish law, citizenship on the vast majority of the Northern Ireland population”.[42] The compatibility of this innovation with international law, according to Ó Caoindealbháin was dubious, "given its attempt to regulate the citizenship of an external territory ... In seeking to extend jus soli citizenship beyond the state’s jurisdiction, the 1956 Act openly sought to subvert the territorial boundary between North and South". The implications of the Act were readily recognised in Northern Ireland, with Lord Brookeborough tabling a motion in the Parliament of Northern Ireland repudiating “the gratuitous attempt … to inflict unwanted Irish Republican nationality upon the people of Northern Ireland”.
Nevertheless, Irish citizenship continued to be extended to the inhabitants of Northern Ireland for over 40 years, representing, according to Ó Caoindealbháin, "one of the few practical expressions of the Irish state’s irredentism." Ó Caoindealbháin concludes, however, that the Good Friday Agreement of 1998 altered significantly the territorial implications of Irish citizenship law, if somewhat ambiguously, via two key provisions: the renunciation of the constitutional territorial claim over Northern Ireland, and the recognition of “the birthright of all the people of Northern Ireland to identify themselves and be accepted as Irish or British or both, as they may so choose”, and that “their right to hold both British and Irish citizenship is accepted by both Governments".
In regard to international law, Ó Caoindealbháin states that, although it is the attempt to confer citizenship extra-territorially without the agreement of the state affected that represents a breach of international law (not the actual extension), the 1956 Act "co-exists uneasily with the terms of the Agreement, and, by extension, the official acceptance by the Irish state of the current border. While the Agreement recognises that Irish citizenship is the birthright of those born in Northern Ireland, it makes clear that its acceptance is a matter of individual choice. In contrast, the 1956 Act continues to extend citizenship automatically in the majority of cases, thereby, in legal effect, conflicting with the agreed status of the border and the principle of consent".
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