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| - There were two elections in Ireland on 24 May 1921, as a result of the Government of Ireland Act 1920 to establish the House of Commons of Northern Ireland and the House of Commons of Southern Ireland. The election was used by Irish Republicans as the basis of membership of the 2nd Dáil. The 2nd Dáil lasted 388 days.
The members who were elected as Sinn Féin candidates are listed below. 124 Sinn Féin candidates were returned unopposed from 26 geographic constituencies and the National University of Ireland. Dublin University returned four Independent Unionist candidates, also unopposed, but they refused to attend Dáil Éireann.
52 members elected from 9 geographic constituencies and the Queen's University of Belfast in Northern Ireland were also entitled to sit in the 2nd Dáil. Six Sinn Féin candidates were elected, 5 of whom had also been returned in the other part of Ireland. 40 Ulster Unionist Party and 5 Nationalist party (a remnant of the old Irish Parliamentary Party which had survived in Ulster) candidates were elected. One of the latter won two seats, making a total of six victories. They all refused to attend Dáil Éireann.
It was during the 2nd Dáil that the Anglo-Irish Treaty was debated. The treaty was ratified by the 2nd Dáil. (en)
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