The United Kingdom is scheduled to leave the European Union on March 29, 2019. UK Prime Minister Theresa May has been scrambling to draft and pass a withdrawal agreement that would prevent a costly and diplomatically destructive exit from the EU without a deal. At the conclusion of a five-day debate, the British legislative House of Commons rejected May’s deal and increased the likelihood of a “no-deal” Brexit. Here are the key dates and players that have led up to the January 15 vote by the members of Parliament.

June 23, 2016 – The UK voted to withdraw from the EU by a margin of 52% to 48%. “Leave” won the majority of votes in England and Wales, while every council in Scotland saw “Remain” majorities. The vote prompted then-Prime Minister David Cameron to step down, replaced by the conservative party leader Theresa May.

March 29, 2017 – May triggers Article 50 of the Lisbon Treaty, which allows a member of the EU to exit the bloc. This starts the two-year deadline of negotiating an exit deal.

March 19, 2018 – The first withdrawal agreement daft is published, bringing up points of contention such as the Irish “backstop,” which would eventually draw a hard border between Ireland and Northern Ireland.

November 25, 2018 – A 585-page draft withdrawal agreement is published after unanimous approval by the EU, but the terms of the backstop to prevent a hard border in Ireland spark anger among Brexiteers and Brexit dissenters alike.

December 10, 2018 – Though a vote on the withdrawal agreement was set for December 11, it became clear that the deal would fail in the House of Commons. May pulls the vote and postpones it until the week of January 14, 2019. EU Commissioner Jean-Claude Juncker expresses that “there is no room whatsoever for renegotiation.”

December 13, 2018 – May survives a vote of “no-confidence” invoked by her own Conservative Tory party.

December 19, 2018 – The European Commission starts implementing its “no deal” Contingency Action Plan  which covers 14 areas where UK withdrawal without a deal would create “major disruption for citizens and businesses” in the remaining 27 EU states.

January 15, 2019 – After five days of debate, May’s withdrawal agreement is rejected by the members of Parliament by a margin of 432 votes against the deal to 202 votes in favor. It is the largest defeat in the House of Commons since 1924. Jeremy Corbyn of the opposition Labour party calls for a second vote of no-confidence set for Wednesday, January 16.

If you would like to read more about the Brexit timeline of events and potential outcomes, please visit Marketwatch, BBC, CNBC, Euractiv, or Yahoo Finance. Photo by Reuters / Kevin Coombs