The 1918 Irish general election is the part of the 1918 United Kingdom general election which takes place in Ireland on December 14, 1918. It is a key moment in modern Irish history because it sees the overwhelming defeat of the moderate nationalist Irish Parliamentary Party (IPP), which had dominated the Irish political landscape since the 1880s, and a landslide victory for Sinn Féin. Sinn Féin had never previously stood in a general election but had won six seats in by-elections in 1917–18. The party vows in its manifesto to establish an independent Irish Republic. In Ulster, however, the Irish Unionist Alliance (IUA) is the most successful party.

In 1918, a system called plural voting is in place in both Britain and Ireland. Plural voting is a practice whereby one person might be able to vote multiple times in an election. Property and business owners can vote both in the constituency where their property lay and that in which they live, if the two are different. In the newly formed Irish Free State this system is ended by the Electoral Act 1923 and is abolished in the United Kingdom by the Representation of the People Act 1948. Plural voting remains in effect in Northern Ireland until 1969.

The 1918 election is held in the aftermath of World War I, the Easter Rising and the Conscription Crisis. It is the first general election to be held after the Representation of the People Act 1918. It is thus the first election in which women over the age of 30, and all men over the age of 21, can vote.

Sinn Féin is founded by Arthur Griffith in 1905. He believes that Irish nationalists should emulate the Ausgleich of Hungarian nationalists who, in the 19th century under Ferenc Deák, had chosen to boycott the imperial parliament in Vienna and unilaterally establish their own legislature in Budapest.

Griffith initially favours a peaceful solution based on “dual monarchy” with Britain, that is two separate states with a single head of state and a limited central government to control matters of common concern only. However, by 1918, under its new leader, Éamon de Valera, Sinn Féin has come to favour achieving separation from Britain by means of an armed uprising if necessary and the establishment of an independent republic.

In the aftermath of the 1916 Easter Rising, the party’s ranks are swelled by participants and supporters of the rebellion as they are freed from British gaols and internment camps. At its 1917 Ardfheis (annual conference) de Valera is elected leader, and the new, more radical policy is adopted.

Prior to 1916, Sinn Féin had been a fringe movement having a limited cooperative alliance with William O’Brien‘s All-for-Ireland League and enjoyed little electoral success. However, between the Easter Rising of that year and the 1918 general election, the party’s popularity increases dramatically. This is due to the failure to have the Home Rule Bill implemented when the IPP resists the partition of Ireland demanded by Ulster Unionists in 1914, 1916 and 1917, but also popular antagonism towards the British authorities created by the execution of most of the leaders of the 1916 rebels and by their botched attempt to introduce Home Rule on the conclusion of the Irish Convention linked with military conscription in Ireland (see Conscription Crisis of 1918).

Sinn Féin demonstrates its new electoral capability in four by-election successes in 1917 in which George Noble Plunkett, Joseph McGuinness, de Valera and W. T. Cosgrave are each elected, although it loses three by-elections in early 1918 before winning two more with Patrick McCartan and Arthur Griffith. In one case there are unproven allegations of electoral fraud. The party benefits from a number of factors in the 1918 elections, including demographic changes and political factors.

In the aftermath of the elections, Sinn Féin’s elected members refuse to attend the British Parliament in Westminster, and instead form a parliament in Dublin, Dáil Éireann (“Assembly of Ireland”), which declares Irish independence as a republic. The Irish War of Independence is conducted under this revolutionary government which seeks international recognition and sets about the process of state-building. The next election is part of 1921 Irish elections.

(Pictured: L to R, Éamon de Valera of Sinn Féin, Sir Edward Carson on the Irish Unionist Alliance, and John Dillon of the Irish Parliamentary Party)