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Can you list the top facts and stats about Brexit?
Summarize this article for a 10 year old
Brexit (/ /,; portmanteau of "British exit") was the withdrawal of the United Kingdom (UK) from the European Union (EU). Following a referendum on 23 June 2016, Brexit officially took place at 23:00 GMT on 31 January 2020 (00:00 1 February 2020 CET). The UK is the only sovereign country to have left the EU. The UK had been a member state of the EU or its predecessor, the European Communities (EC), since 1 January 1973. Following Brexit, EU law and the Court of Justice of the European Union no longer have primacy over British laws. The European Union (Withdrawal) Act 2018 retains relevant EU law as domestic law, which the UK can amend or repeal.
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of the European Union
The EU and its institutions developed gradually after their establishment. Throughout the period of British membership, Eurosceptic groups had existed, opposing aspects of the EU and its predecessors. Labour prime minister Harold Wilson's pro-EC government held a referendum on continued EC membership in 1975, in which 67.2 per cent of those voting chose to stay within the bloc. Despite growing political opposition to further European integration aimed at "ever closer union" between 1975 and 2016, notably from Margaret Thatcher in the late 1980s and 1990s, and factions of the Conservative Party in the 2000s, no further referendums on the issue were held.
By the 2010s, the growing popularity of UK Independence Party (UKIP), as well as pressure from Eurosceptics in the Conservative Party, persuaded then-Prime Minister David Cameron to promise a referendum on British membership of the EU if his government was re-elected. Following the general election in 2015, which produced a small but unexpected overall majority for the governing Conservative Party, the promised referendum on continued EU membership was held on 23 June 2016. Notable supporters of the Remain campaign included Cameron, future Prime Ministers Theresa May and Liz Truss, and former Prime Ministers John Major, Tony Blair, and Gordon Brown; while notable supporters of the Leave campaign included future Prime Ministers Boris Johnson and Rishi Sunak. The electorate voted to leave the EU with a 51.9% share of the vote, with all regions of England and Wales except London voting in favour of Brexit, and Scotland and Northern Ireland voting against. The result led to Cameron's sudden resignation, his replacement by then-Home Secretary Theresa May, and four years of negotiations with the EU on the terms of departure and on future relations, completed under a Boris Johnson government, with government control remaining with the Conservative Party during this period.
The negotiation process was both politically challenging and deeply divisive within the UK, leading to two snap elections in 2017 and 2019. One deal was overwhelmingly rejected by the UK Parliament, causing great uncertainty and leading to postponement of the withdrawal date to avoid a no-deal Brexit. The UK left the EU on 31 January 2020 after a withdrawal deal was passed by Parliament but continued to participate in many EU institutions (including the single market and customs union) during an eleven-month transition period in order to ensure frictionless trade until all details of the post-Brexit relationship were agreed and implemented. Trade deal negotiations continued within days of the scheduled end of the transition period and the EU–UK Trade and Cooperation Agreement was signed on 30 December 2020. The effects of Brexit are in part determined by the cooperation agreement, which provisionally applied from 1 January 2021, until it formally came into force on 1 May 2021.
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