Brexit Vote
On 23 June 2016, voters in the United Kingdom took part in a referendum on whether to remain in the European Union or leave it. Leave won with roughly 52 percent of the vote to Remain's 48 percent, on a turnout of about 72 percent. The result set in motion the first withdrawal of a member state from the EU, reshaped British politics, and opened years of negotiation over the country's future relationship with its nearest neighbors.
Britain had joined the European Economic Community in 1973, and its membership was never free of controversy. A referendum in 1975 confirmed it, but skepticism persisted, fed by debates over sovereignty, regulation, immigration, and the costs and benefits of closer integration. The UK kept its own currency and stayed outside the Schengen travel area. In the 2010s, the rise of the UK Independence Party and pressure within the Conservative Party pushed Prime Minister David Cameron to promise an in-or-out referendum, which he pledged in 2013 and scheduled after winning the 2015 general election.
The campaign was fiercely contested. Leave campaigners argued that Britain should "take back control" of its laws, borders, and money, while Remain campaigners warned of economic damage and lost influence. Both sides were accused of misleading claims. The result revealed sharp divisions: England and Wales voted to leave, while Scotland and Northern Ireland voted to remain. Older voters and those outside major cities leaned toward Leave, while younger voters and Londoners largely favored Remain. Cameron resigned the next morning, and Theresa May became prime minister.
The process of leaving proved turbulent. May triggered Article 50 of the Treaty on European Union in March 2017, starting a two-year countdown. Her withdrawal agreement was rejected by Parliament three times, largely over the question of the Irish border and the "backstop" meant to keep it open. May resigned in 2019, and Boris Johnson won a large majority in that year's election on the promise to "get Brexit done." The UK formally left the EU on 31 January 2020, followed by a transition period. A trade deal was agreed in December 2020 and took effect at the start of 2021.
Assessing the consequences remains contentious. Most economists have found that Brexit has reduced trade and weighed on growth compared with remaining, though the exact scale is debated. Trade friction, new customs checks, and arrangements for Northern Ireland have remained politically sensitive, and the vote renewed calls for Scottish independence. Brexit also reshaped British party politics and became a defining example of the populist and sovereignty-driven movements seen across many democracies in the period.