January 23, 2013: British PM David Cameron promises a referendum on Britain's membership in the EU if the Conservative party is elected in the next general election.
May 7, 2015: British voters elect a majority Conservative government. Cameron confirms in his victory speech that there will be an "in/out" referendum on European Union membership.
February 21, 2016: Cameron is struck with a severe blow when one of his closest Conservative allies, the media-savvy Boris Johnson, joins the Leave campaign. (Reuters)
June 16, 2016: One week before the referendum, Labour Party lawmaker and "remain" campaigner Jo Cox is killed by extremist Thomas Mair who shouted "Britain First" before shooting and stabbing her. (AP)
June 23, 2016: Britain votes 52 percent to 48 percent to leave the European Union. (AP)
July 13, 2016: Following a Conservative Party leadership contest, Home Secretary Theresa May becomes prime minister. In pic: British PM Theresa May and her husband Philip wave from the steps of her official residence,10 Downing Street in London. (AP)
March 29, 2017: The British government formally triggers Article 50, setting in motion a plan for Britain to leave the EU. In pic: Demonstrators take part in the "Scotland says stay" rally are moved on from outside the Scottish Parliament as the debate on the triggering of article 50 in the main chamber takes place in Edinburgh, Scotland, Britain. (REUTERS)
July 7, 2018: May and her Cabinet endorse the so-called "Chequers Plan" worked out at a fractious session at the prime minister's country retreat. It leads to the resignations of Brexit Secretary David Davis, Foreign Secretary Boris Johnson and others who favor a more complete break with EU. In pic: Britain's Prime Minister Theresa May and her cabinet discuss the government's Brexit plans at Chequers, the Prime Minister's official country residence, near Aylesbury, Britain. (Reuters)
November 25, 2018: EU leaders approve a withdrawal deal reached with Britain after months of difficult negotiations. May urges British Parliament to do the same. (AP)
January 16, 2019: PM Theresa May narrowly survived a vote of no-confidence in Parliament as more than 100 lawmakers from May's party who had earlier opposed Brexit voted to support her government.(Reuters)