So ends the most bitter and polarising experience of British electoral democracy. The economics of Brexit was heatedly and endlessly debated in the UK’s referendum campaign on EU membership, but ultimately it was trumped by voters’ considerations about national integrity and identity. A majority of 17.4m people voted to leave, against 16.1m for remain.

How the drama unfolded

Assiduous watchers of the early referendum results had been advised that if the outcome in Sunderland (perenially among the first to declare election results) showed anything more than a six-point winning margin for Leave, then Brexit would be the likely outcome nationally. Anything less, however, and Remain could expect overall victory.

In the event, Sunderland produced a remarkable 22-point margin in favour of Leave (61-39), while nearby Newcastle, which had been expected to produce a comfortable margin for Remain, only narrowly favoured the pro-EU choice (51% to 49%). The value of sterling fell off a cliff as the currency markets reacted to these early shocks, but the Remain side’s nerves were briefly steadied a little by better than predicted results in Swindon and Lewisham.

But the bad news for Remain continued to pile up, as a pattern of polarisation emerged, with Leave areas proving even more hostile to the EU than had been expected, especially in the north, eastern England and Wales, and Remain areas being more supportive, at least in parts of London.

At 72%, turnout was extraordinarily high by the standards of recent general elections, but especially in the pro-Leave areas. Appalling weather on the day may have depressed turnout in London, while the other major pro-Leave zone, Scotland, saw a lower than average turnout as well – 67%. By 2am, quantitative forecasters were giving Remain a negligible chance of winning, and predicting 56% for Leave, while the bookies now made the Brexit side favourites to win.

By 2.30am there were glimmers of renewed hope for the increasingly despondent Remain campaign with the first results coming in from London – a massive 79% pro-Remain vote from Lambeth, followed shortly after by a 75% pro-Remain vote in Wandsworth, and 70% in Hammersmith and Fulham. This was enough to put Remain in the lead once again, yet only fleetingly.

Ultimately these pockets of pro-European sentiment were not enough and by 5.30am the outcome was confirmed: the UK had voted to leave the EU.

The final figures showed a 52%-48% winning majority on a 72% turnout. Voters had understood that this was a more existential question than a mere general election and mobilised in greater numbers than had been their wont for nearly two decades.

In demographic terms, the Remain and Brexit camps have been well defined for some time. Support for Brexit resembles that for UKIP in various ways, with particular strengths among older people, lower social class and less well educated voters. In YouGov’s last referendum poll conducted on the day of the vote itself, Leave seemed to enjoy commanding leads among voters aged over 50, and those whose highest educational qualification was GCSE or lower. Remain was the clear preference of those aged 18-49 and those educated to A-Level or degree standard.

While Remain voters were primarily motivated by concerns about the economy and what was in the best interests of their families, Leave supporters were chiefly driven by the desire to enhance the UK’s ability to act independently of other countries and to deal with the issue of immigration. The country split quite neatly into those for whom pocketbook considerations were paramount (and who opted for Remain) and those who sought to protect national integrity and identity (and who chose to Leave).

Referendum geography

The polarisation of the UK is now sharply apparent in geographical terms. The vote for Brexit was strongest in a swathe of areas running down the east of England, especially in parts of Lincolnshire, Essex and the East Midlands, while London, Scotland and Northern Ireland remain the outposts of pro-EU sentiment. With Wales also voting for Leave, the electoral picture shows a nation divided.

Beyond the UK (or what will eventually be left of it) the ramifications will be felt with great resonance: France, Italy and the Netherlands are demanding their own national referenda on EU membership. Closer to home, relations between two Irelands, one in the EU and one outside it, will bring further complexity to that island’s convoluted and troubled politics. This one will run and run.

This article was originally published on The Conversation.