For the first time since Northern Ireland was created a century ago, an Irish nationalist party has won the largest number of seats in its devolved legislature.
Sinn Féin emerged from Thursday’s Assembly election with 27 seats, ahead of the Democratic Unionist Party on 25. Michelle O’Neill therefore has the right to be nominated as First Minister, which would make her the first politician from the nationalist tradition to occupy Northern Ireland’s top devolved office. The Alliance Party also recorded a major breakthrough, winning 17 seats and strengthening a political bloc that defines itself as neither unionist nor nationalist.
It is difficult to overstate the symbolism of the result. Northern Ireland was created in 1921 with a Protestant and unionist majority, and unionist parties dominated its government for generations. The central political question running through the region’s history has been whether it should remain part of the United Kingdom or eventually become part of a united Ireland.
For most of that history, the answer was built into the political structure itself. Unionists were electorally dominant.
That is no longer true.
Yet the easiest interpretation of Thursday’s result is also probably the most misleading: Sinn Féin won, therefore Northern Ireland has voted for Irish reunification.
It has not.
Assembly elections do not determine Northern Ireland’s constitutional status. Under the arrangements established by the Good Friday Agreement, any change to that status would require consent through a separate referendum. A Sinn Féin First Minister therefore does not create a united Ireland by institutional momentum.
The election tells us something subtler.
The political balance that once made unionist dominance appear permanent has disappeared.
That is significant even if the border itself does not move.
Sinn Féin’s achievement is partly remarkable because the party did not make an immediate border referendum the dominant theme of its campaign. Michelle O’Neill emphasised issues such as the cost of living, healthcare and government performance while maintaining Sinn Féin’s long-term commitment to Irish unity.
That strategy appears to recognise something important about modern Northern Ireland.
Constitutional identity still matters enormously, but voters also live ordinary political lives.
They use hospitals.
They pay energy bills.
They worry about housing, wages and schools.
A political system structured historically around nationalism and unionism can therefore become increasingly pressured by voters asking governments to solve problems that cannot be reduced to the border.
That may be one reason the Alliance Party’s result is nearly as politically interesting as Sinn Féin’s.
Alliance won 17 seats, a gain of nine from the previous Assembly election.
The party describes itself as neither unionist nor nationalist and draws support from voters who do not want their politics organised primarily around Northern Ireland’s constitutional identity.
That suggests the political system may be changing along two dimensions simultaneously.
Nationalists are becoming electorally strong enough to lead the government.
At the same time, more voters appear willing to reject the traditional nationalist-unionist binary altogether.
Those developments can sound contradictory.
They are not.
Political systems can become more competitive around an old cleavage while simultaneously becoming less dominated by that cleavage.
Imagine a society originally divided almost completely between Group A and Group B. For decades, A is larger and therefore controls government. Over time, A and B become roughly equal while Group C also grows.
The original divide has become less dominant even as competition between A and B becomes more balanced.
Northern Ireland increasingly resembles that structure.
This matters because the institutions created by the 1998 Good Friday Agreement were designed specifically to manage conflict between unionism and nationalism. Power-sharing requires cooperation across those traditions. The First Minister and deputy First Minister come from different designations and exercise effectively joint authority, even though the titles sound hierarchical.
That institutional design was enormously important because Northern Ireland was emerging from roughly three decades of conflict known as the Troubles. The objective was not to create a system in which one side defeated the other electorally. It was to construct institutions in which neither community could govern without the other.
This is consociational democracy: deeply divided societies sometimes stabilise by guaranteeing major groups access to power rather than relying on simple majority rule.
The advantage is obvious.
If losing an election means your entire community could be permanently excluded from government, political defeat becomes existential. Guaranteed power-sharing lowers that cost.
The disadvantage is that institutions can preserve the political identities they were designed to manage.
If government offices, parliamentary procedures and political bargaining are organised around the categories unionist and nationalist, politicians and voters continue to receive incentives to organise through those categories.
The agreement helps prevent conflict between the blocs.
It can also make the blocs unusually durable.
Alliance’s growth therefore creates an institutional problem of success.
The peace settlement may have worked well enough that increasing numbers of citizens no longer define themselves primarily through the divide around which the settlement was constructed.
What happens when the political institutions created to manage two communities encounter a growing third group that does not want to join either?
That is a much more interesting democratic question than simply asking whether Sinn Féin’s victory means reunification.
Institutions are designed around assumptions about society.
Society then changes.
Eventually the institution has to adapt or it begins representing yesterday’s political structure more accurately than today’s.
Brexit has accelerated this transformation.
Northern Ireland voted to remain in the European Union in the 2016 referendum, while the United Kingdom as a whole voted to leave. Brexit therefore created a particularly difficult geographical problem: Northern Ireland left the EU as part of the UK but shares a land border with the Republic of Ireland, which remains an EU member.
Re-establishing a hard customs border across the island risked damaging one of the practical foundations of the peace process. Yet allowing completely unrestricted movement of goods between Northern Ireland and the Republic could create a backdoor into the EU single market from the rest of the UK.
The eventual answer was the Northern Ireland Protocol, which left Northern Ireland following various EU goods rules and introduced checks on some goods moving from Great Britain into Northern Ireland.
Economically, the arrangement attempts to solve an almost impossible geometry.
Politically, it created another identity problem.
Unionists argue that placing trade barriers inside the United Kingdom weakens Northern Ireland’s constitutional position because goods moving from Britain to Northern Ireland are treated differently from goods moving between England, Scotland and Wales.
The DUP has made opposition to the protocol central to its politics.
That means Brexit, originally presented partly as restoring British sovereignty, has produced an arrangement that some of the most committed defenders of Northern Ireland’s British identity believe weakens their connection to Britain.
Political policies frequently create these second-order effects.
An action intended to strengthen sovereignty at one level can destabilise another constitutional relationship underneath it.
The DUP’s difficulties cannot be explained entirely by Brexit, but the protocol has clearly intensified strategic divisions within unionism. More hardline unionist voters can move towards smaller parties, while moderate or non-aligned voters can move towards Alliance.
That makes the DUP vulnerable from both directions.
Unionism therefore faces a challenge similar to traditional parties elsewhere in Europe. It cannot assume that historical identity automatically guarantees future electoral loyalty.
Demographic change contributes to that uncertainty too, although demographics should be treated carefully. Northern Ireland’s Catholic population has grown relative to its Protestant population over decades, but religion does not translate mechanically into constitutional preference.
Not every Catholic supports reunification.
Not every Protestant will necessarily oppose it forever.
Increasing numbers of people identify with neither traditional religious category.
Political identities can change across generations.
Treating demographic trends as an automatic countdown to Irish unity therefore mistakes social categories for fixed voting behaviour.
The more useful question is how those demographic shifts alter political competition.
They reduce the assumption that unionists will always possess an electoral plurality simply because the state was originally created with one.
That changes bargaining power even before anybody votes in a border poll.
Sinn Féin’s victory has enormous symbolic power for exactly this reason.
A political office once effectively guaranteed to unionism may now be held by nationalism.
But symbolism needs to be separated from institutional power.
Michelle O’Neill becoming First Minister would not make the deputy First Minister subordinate. Under Northern Ireland’s power-sharing arrangements, the two offices operate jointly, and one cannot effectively function without the other.
That detail matters because the titles create the appearance of hierarchy where the constitutional structure deliberately avoids much of one.
Still, symbols influence politics.
The fact that the nationalist nominee receives the title “First Minister” will be interpreted as evidence that Northern Ireland’s political centre of gravity has shifted.
Symbols matter because they change expectations about what is normal.
Twenty years ago, Sinn Féin leading the Northern Ireland government would have appeared extraordinary.
Once it happens, it becomes part of ordinary democratic competition.
Normalisation can change political possibility.
This resembles Marine Le Pen’s strategy in France in a completely different ideological context. An outcome can move from unthinkable to possible before it moves from possible to likely.
Political systems are partly constrained by the range of outcomes citizens can imagine.
Sinn Féin’s result enlarges that range.
Irish reunification becomes easier to discuss politically when the party advocating it is simultaneously responsible for ordinary government rather than existing primarily as an opposition movement associated with constitutional conflict.
But governing creates risks for Sinn Féin too.
It is much easier to advocate structural change than to administer waiting lists, budgets, schools and public services.
If Sinn Féin wants to persuade undecided voters that a united Ireland would provide effective government, its performance in Northern Ireland becomes part of the argument.
Government can therefore strengthen nationalist legitimacy.
It can also expose failure.
This is a recurring pattern. Opposition movements have considerable freedom to define themselves through what they oppose. Once they govern, citizens acquire measurable expectations.
Sinn Féin will be judged not only by whether its constitutional vision inspires supporters but by whether ordinary institutions work.
There is another complication: the new executive may not even form smoothly.
The DUP has indicated it will not nominate ministers unless its concerns over the Northern Ireland Protocol are addressed. Because the power-sharing system requires participation from both major traditions, one side refusing to participate can prevent the executive from functioning.
That creates an uncomfortable democratic problem.
Sinn Féin has won the largest number of seats.
Yet the largest party cannot simply form a government.
Again, this is not necessarily institutional failure. The system was deliberately designed so that one community cannot dominate the other through majority rule.
The cost of that protection is mutual veto power.
A veto can prevent domination.
It can also create paralysis.
This is one of the fundamental trade-offs of power-sharing systems.
Bosnia faces a much more extreme version of the same problem. Lebanon’s sectarian political system contains another. Institutions designed to prevent one community monopolising the state can make collective decision-making difficult because each group receives mechanisms for blocking outcomes it considers threatening.
The alternative—ordinary majority government—can be dangerous when communities believe majority rule would become permanent ethnic or national domination.
So the institutional problem is not simply removing vetoes.
It is gradually creating enough shared political identity that fewer questions require communal vetoes in the first place.
Alliance’s growth may be relevant here.
If more voters begin choosing parties based on policy rather than constitutional identity, Northern Ireland’s politics could gradually become more conventional.
Left versus right.
Public spending versus taxation.
Climate policy.
Healthcare.
Education.
Those disagreements are not necessarily easier.
They are less existential.
A disagreement over healthcare spending can be reversed after an election.
A disagreement over which country you belong to feels more permanent.
Democratic stability often depends on reducing how many political questions become existential.
That may be one of the deepest achievements of the Good Friday Agreement. It did not resolve whether Northern Ireland should be British or Irish.
It created institutions through which people could continue disagreeing about that question without returning to large-scale violence.
Perhaps successful peace agreements should be evaluated that way.
They do not eliminate conflict.
They change its form.
Bullets become ballots.
Constitutional demands become campaign platforms.
Political enemies become coalition partners.
The disagreement survives while the cost of expressing it falls dramatically.
Sinn Féin becoming the largest party should therefore be understood partly as evidence that the system has worked.
A nationalist political movement can now pursue its constitutional objective through elections and institutions rather than through violence.
That does not mean Northern Ireland’s peace is complete or irreversible. Sectarian divisions remain, paramilitary structures have not disappeared entirely, and political institutions have repeatedly experienced periods of suspension.
But Thursday’s election is still remarkable when placed beside the region’s twentieth-century history.
A party historically associated with the republican movement has won the largest number of Assembly seats.
Unionists are understandably unsettled by the symbolism.
Nationalists are understandably celebrating it.
And the political response is not supposed to be war.
It is another negotiation over forming a government.
That is an enormous institutional achievement disguised as an ordinary election.
The next question is whether Northern Ireland’s political institutions can adapt to the society that peace itself helped create.
The Good Friday Agreement was designed around two communities whose constitutional conflict had produced decades of violence.
Twenty-four years later, one of those communities has become electorally larger than the other, while a growing number of voters identify comfortably with neither.
That does not make the agreement obsolete.
It makes its success more complicated.
Strong institutions do not simply survive.
They adapt when the society they stabilised begins changing because stability allowed it to change.
Sinn Féin’s victory does not mean Northern Ireland has voted to leave the United Kingdom.
Alliance’s rise does not mean constitutional identity has stopped mattering.
The DUP’s decline does not mean unionism is disappearing.
The result is more interesting than any of those conclusions.
Northern Ireland is slowly becoming a political system in which the categories that once appeared permanent are becoming less predictable.
That uncertainty can feel threatening.
In a democracy, it can also be progress.
The most important transformation may not be that nationalists can now win.
It may be that everyone increasingly has to compete for voters rather than assuming history has already decided which community will always govern.
