Donald Trump is projected to have won three out of seven crucial swing states in the US presidential election, putting him on the cusp of taking back the White House.

The projected results in two swing states – North Carolina, Georgia and Pennsylvania – come as signs suggest at least one other state is leaning towards the Republican former president.

It could still be some time before we find out the final detailed results in the race between Trump and Democrat Kamala Harris.

Results are declared state-by-state, and the BBC is keeping you updated with a running tally as we go.

The race is coming down to results from seven swing states, which before election day experts believed either Harris or Trump could win.

Turnout has been high in early voting, both in-person and by mail, with records broken in some states.

It’s worth noting that votes are very much still being counted. Nonetheless, there are some signs of how voting in these key states is going.

Right now, Donald Trump is projected to win:

Trump also looks to be ahead in:

• Wisconsin, where an overall result may also take some time

The race is very close in:

• Michigan, where a final result is not expected until the end of Wednesday
• Arizona, where the overall count could take days
• Nevada, where the overall count could also take days

Donald Trump’s projected wins in the three battleground states put him on the cusp of victory in the election.

In some presidential races, the victor has been named late on election night, or early the next morning.

There were fears that what appeared to be a knife-edge race in many states could complicate how quickly media outlets projected a winner this time around. Narrow victories could also have meant recounts.

Instead, results were declared in many of the battleground states much more quickly than had been predicted – allowing media outlets to project Trump or Harris as the winner in some of them.

But it might take days or even weeks for the detailed final results of the election to be confirmed officially in every state.

Legal challenges are also possible. More than 100 pre-election lawsuits have already been filed, mostly by Republicans challenging voter eligibility and voter roll management.

Counting can take some time, with the verification of ballots requiring comparisons with active voter numbers; removing, unfolding and examining every single ballot for tears, stains or damage; and documenting and investigating any inconsistencies.

On the other hand, vote-counting has sped up in some areas, including the crucial state of Michigan, and fewer votes have been cast by mail than in the last election, which was during the Covid pandemic.

In the 2020 election, US TV networks did not declare Joe Biden the winner until four days after election day, when the result in Pennsylvania became clearer.

In other recent elections, voters have had a much shorter wait.

In 2016, Trump was declared the winner shortly before 03:00 EST (08:00 GMT) a few hours after polls closed.

In 2012, when Barack Obama secured a second term, his victory was projected before midnight the same evening of election day.

However, the 2000 election between George W Bush and Al Gore was a notable exception. The race was not decided for five weeks, when the US Supreme Court voted to end Florida’s recount. That kept Bush in place as winner and handed him the White House.

Once every valid vote has been included in the final results, a process known as the electoral college comes into play.

In each state a varying number of electoral college votes can be won, and it is securing these – and not just the backing of voters themselves – that ultimately wins the presidency.

Generally, states award all of their electoral college votes to whoever wins the popular vote and this is confirmed after meetings on 17 December.

The new US Congress then meets on 6 January to count the electoral college votes and confirm the new president.

After the 2020 election, Trump refused to concede and rallied supporters to march on the US Capitol as Congress was meeting to certify Biden’s victory.

He urged his Vice-President, Mike Pence, to reject the results – but Pence refused.

Even after the riot was cleared and members of Congress regrouped, 147 Republicans voted unsuccessfully to overturn Trump’s loss.

Electoral reforms since then have made it harder for lawmakers to object to certified results sent to them from individual states. They have also clarified that the vice-president has no power to unilaterally reject electoral votes.

Nevertheless, election watchers expect that efforts to delay certification of the 2024 vote could take place at the local and state level.

Trump, his running mate JD Vance and top Republican leaders on Capitol Hill have refused on several occasions to state unequivocally that they will accept the results if he loses.

The president-elect will begin their term in office after being inaugurated on Monday, 20 January 2025, in the grounds of the US Capitol complex.

It will be the 60th presidential inauguration in US history.

The event will see the new president sworn in on a pledge to uphold the Constitution and then deliver their inaugural address.