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Britain’s delayed and disputed Brexit bill became law on Thursday, removing the last U.K. obstacle to the country leaving the European Union in just over a week.

Deputy Speaker Nigel Evans announced in the House of Commons that the Withdrawal Agreement Act had received royal assent from Queen Elizabeth II, the final formality in the measure’s legislative journey.

The brief announcement, which drew cheers of “hear, hear” from some Conservative lawmakers in the Commons, came hours after the bill completed its passage through Parliament by getting approval from the House of Lords.

READ MORE: British government plans Brexit celebration but says some businesses may suffer

“At times it felt like we would never cross the Brexit finish line, but we’ve done it,” Prime Minister Boris Johnson said after that milestone late Wednesday.

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The European Union’s parliament also must approve the Brexit divorce deal before Jan. 31 if Britain is to leave on time. Lawmakers in Brussels are due to vote on it next week.

The U.K. is finally leaving the EU more than 3 1/2 years after voters narrowly opted for Brexit in a June 2016 referendum — and after many rounds of political wrangling.

After years of negotiations between the British government and the EU, U.K. lawmakers repeatedly defeated attempts by both Johnson and predecessor Theresa May to finalize departure terms with the other 27 nations of the bloc.

That changed when Johnson’s Conservatives won the Dec. 12 election, giving the government the ability to override the objections of opposition parties.

1:25 Boris Johnson discusses post-Brexit relationship with EU head Boris Johnson discusses post-Brexit relationship with EU head

Opposition members of the House of Lords battled to amend the withdrawal bill but were overruled by Johnson’s 80-strong majority in the Commons.

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But deep divisions over Brexit remain. After royal assent was announced, Scottish National Party lawmaker Ian Blackford said the U.K. was in a “constitutional crisis” because the legislatures in Scotland, Wales and Northern Ireland did not back the Brexit bill.

“Boris Johnson has trampled over the democratic votes in Edinburgh, Belfast and Cardiff,” Blackford said.

The Scottish National Party says Scotland should hold a referendum on independence from the U.K., which Johnson refuses to allow.

0:38 What about the Scottish independence vote? What about the Scottish independence vote?

Despite Johnson’s repeated promise to “get Brexit done” on Jan. 31, the day of departure only marks the start of the first stage of the country’s EU exit.

Britain and the EU are to then launch into negotiations on their future ties, racing to strike new relationships for trade, security and a host of other areas by the end of 2020.

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Johnson insists he won’t agree to any delay beyond the end of the year. The U.K. is also keen to begin talks on a free trade deal with the United States, and intends to negotiate simultaneously with the EU and the U.S.

Speaking at the World Economic Forum in the Swiss ski resort of Davos, U.S. Treasury Secretary Steven Mnuchin said a deal with Britain was “an absolute priority of President Trump and we expect to complete that within this year.”

U.S. Commerce Secretary Wilbur Ross said a trade deal between the two countries shouldn’t be too difficult because their economies are similar.

0:45 Johnson wants Big Ben to ring U.K. out of the European Union Johnson wants Big Ben to ring U.K. out of the European Union

“Both are very heavily services oriented and within services, such as financial services there’s already a pretty high degree of integration and co-ordination so it should be much easier mechanically,” he said in Davos.

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But British opposition politicians are already raising concerns about issues ranging from food-safety standards _ especially the U.S. practice of chlorine-washing chicken to kill germs _ to drug prices.

Ross sought to dampen concerns that a trade deal would mean higher drug prices as U.S. pharmaceutical companies look to gain concessions from Britain’s state-run National Health Service.

“What we think is that drugs should have similar prices wherever they are but I don’t believe we are in any position to tell the U.K. what they should pay for drugs,” he said.