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A still image taken from footage broadcast by the UK Parliamentary Recording Unit (PRU) on March 29, 2017 shows British Prime Minister Theresa May at the dispatch box making a statement in the House of Commons in London after the letter invoking the provisions of Article 50 of the Lisbon Treaty was delivered to President of the European Council Donald Tusk in Brussels starting Britain's formal withdrawl from the European Union (EU). 
Britain formally launches the process for leaving the European Union on March 29, 2017, a historic step that has divided the country and thrown into question the future of the European unity project. / AFP PHOTO / PRU AND AFP PHOTO / - / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT " AFP PHOTO / PRU " - NO USE FOR ENTERTAINMENT, SATIRICAL, MARKETING OR ADVERTISING CAMPAIGNS-/AFP/Getty Images
A still image taken from footage broadcast by the UK Parliamentary Recording Unit (PRU) on March 29, 2017 shows British Prime Minister Theresa May at the dispatch box making a statement in the House of Commons in London after the letter invoking the provisions of Article 50 of the Lisbon Treaty was delivered to President of the European Council Donald Tusk in Brussels starting Britain's formal withdrawl from the European Union (EU). 
Britain formally launches the process for leaving the European Union on March 29, 2017, a historic step that has divided the country and thrown into question the future of the European unity project. / AFP PHOTO / PRU AND AFP PHOTO / - / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT " AFP PHOTO / PRU " - NO USE FOR ENTERTAINMENT, SATIRICAL, MARKETING OR ADVERTISING CAMPAIGNS-/AFP/Getty Images

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    Brexit: What happens after Article 50?

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Brexit: What happens after Article 50?

The triggering of Article 50 will mark the start of official Brexit negotiations between the UK and the EU. CNN's Max Foster looks at what happens next.

Brexit: What happens after Article 50?

The triggering of Article 50 will mark the start of official Brexit negotiations between the UK and the EU. CNN's Max Foster looks at what happens next.