Prime Minister Boris Johnson

Britain on Friday ended 47 years of European Union membership, making a historic exit after years of bitter arguments, the resignation by two prime ministers, to chart its own uncertain path in the world.

There were celebrations and tears across the country as the EU’s often reluctant member became the first to leave an organisation set up to forge unity among nations after the horrors of World War II.

Thousands of people waving Union Jack flags packed London’s Parliament Square to mark the moment of Brexit at 11 pm (2300 GMT) — midnight in Brussels.

“We are a free nation,” declared John Moss, a 44-year-old businessman who joined the crowd, which erupted into cheers as the clock ticked down.

A historic day, 11p.m 31 January 2020: UK says so long to EU after 47 years of togetherness

Many pro-Europeans, including many of the 3.6 million EU citizens who made their lives in Britain, marked the occasion with solemn candlelit vigils.

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One Brexit supporter set fire to an EU flag in central London.

Away from the celebrations, many fear the consequences of ending 47 years of ties with their nearest neighbours.

Supporters of Brexit celebrate in London

It has also provoked soul-searching in the EU about its own future after losing 66 million people, a global diplomatic big-hitter and the clout of the City of London financial centre.

Prime Minister Boris Johnson, a figurehead in the seismic 2016 referendum vote for Brexit, acknowledged there might be “bumps in the road ahead” but said Britain could make it a “stunning success”.

As he held a party in his Downing Street office, a clock projected on the walls outside counted down the minutes until Brexit.

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Johnson has promised to unite the island nation in a new era of prosperity, predicting a “new era of friendly cooperation” with the EU while Britain takes a greater role on the world stage.

“The most important thing to say tonight is that this is not an end but a beginning,” he said in a televised address.

EU institutions earlier began removing red, white and blue Union flags in Brussels ahead of a divorce that German Chancellor Angela Merkel called a “sea-change” for the bloc.

French President Emmanuel Macron described it as a “historic warning sign” that should force the EU and its remaining nations of more than 440 million people to stop and reflect.

Britain’s departure was sealed in an emotional vote in the EU parliament this week that ended with MEPs singing “Auld Lang Syne”, a traditional Scottish song of farewell.

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But almost nothing will change straight away, because of an 11-month transition period negotiated as part of the exit deal.

Britons will be able to work in and trade freely with EU nations until December 31, and vice versa, although the UK will no longer be represented in the bloc’s institutions.

But legally, Britain is out.

And while the divorce terms have been agreed, Britain must still strike a deal on future relations with the EU, its largest trading partner.