With just one day to go, the race for the White House is deadlocked – both at the national level and in the all-important battleground states.
The polls are so close, within the margin of error, that either Donald Trump or Kamala Harris could actually be two or three points better off – enough to win comfortably.
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There is a compelling case to make for why each may have the edge when it comes to building a coalition of voters in the right places, and then ensuring they actually turn out.
Let’s start with the history-making possibility that a defeated president might be re-elected for the first time in 130 years.
Trump could win because…
1. He’s not in power
The economy is the number one issue for voters, and while unemployment is low and the stock market is booming, most Americans say they are struggling with higher prices every day.
Inflation hit levels not seen since the 1970s in the aftermath of the pandemic, giving Trump the chance to ask “Are you better off now than you were four years ago?”
In 2024, voters around the world have several times thrown out the party in power, partly due to the high, post-Covid, cost of living. US voters also seem hungry for change.
Only a quarter of Americans say they are satisfied with the direction the country is going in and two-thirds have a poor economic outlook.
Harris has tried to be the so-called change candidate, but as vice-president has struggled to distance herself from an unpopular Joe Biden.
2. He seems impervious to bad news
Despite the fallout from the 6 January 2021 riot at the US Capitol, a string of indictments and an unprecedented criminal conviction, Trump’s support has remained stable all year at 40% or above.
While Democrats and “Never-Trump” conservatives say he is unfit for office, most Republicans agree when Trump says he’s the victim of a political witch-hunt.
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With both sides so dug in, he just needs to win over enough of the small slice of undecided voters without a fixed view of him.
3. His warnings on illegal immigration resonate
Beyond the state of the economy, elections are often decided by an issue with an emotional pull.
Democrats will hope it’s abortion, while Trump is betting it’s immigration.
After encounters at the border hit record levels under Biden, and the influx impacted states far from the border, polls suggest voters trust Trump more on the immigration – and that he’s doing much better with Latinos than in previous elections.
Trump’s appeal to voters who feel forgotten and left behind has transformed US politics by turning traditional Democratic constituencies like union workers into Republicans and making the protection of American industry by tariffs almost the norm.
If he drives up turnout in rural and suburban parts of swing states this can offset the loss of moderate, college-educated Republicans.
5. He’s seen as a strong man in an unstable world
Trump’s detractors say he undermines America’s alliances by cosying up to authoritarian leaders.
The former president sees his unpredictability as a strength, however, and points out that no major wars started when he was in the White House.
Many Americans are angry, for different reasons, with the US sending billions to Ukraine and Israel – and think America is weaker under Biden.
Despite Trump’s advantages, he remains a deeply polarising figure.
In 2020, he won a record number of votes for a Republican candidate, but was defeated because seven million more Americans turned out to support Biden.
This time, Harris is playing up the fear factor about a Trump return. She’s called him a “fascist” and a threat to democracy, while vowing to move on from “drama and conflict”.
A Reuters/Ipsos poll in July indicated that four in five Americans felt the country was spiralling out of control. Harris will be hoping voters – especially moderate Republicans and independents – see her as a candidate of stability.
2. She’s also not Biden
Democrats were facing near-certain defeat at the point Biden dropped out of the race. United in their desire to beat Trump, the party quickly rallied around Harris. With impressive speed from a standing start, she delivered a more forward-looking message that excited the base.
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While Republicans have tied her to Biden’s more unpopular policies, Harris has rendered some of their Biden-specific attack lines redundant.
The clearest of these is age – polls consistently suggested voters had real concerns about Biden’s fitness for office. Now the race has flipped, and it is Trump who’s vying to become the oldest person to ever win the White House.
This is the first presidential election since the US Supreme Court overturned Roe v Wade and the constitutional right to an abortion.
Voters concerned about protecting abortion rights overwhelmingly back Harris, and we’ve seen in past elections – notably the 2022 midterms – that the issue can drive turnout and have a real impact on the result.
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This time around, 10 states, including the swing state Arizona, will have ballot initiatives asking voters how abortion should be regulated. This could boost turnout in Harris’s favour.
The historic nature of her bid to become the first female president may also strengthen her significant lead among women voters.
4. Her voters are more likely to show up
The groups Harris is polling more strongly with, such as the college-educated and older people, are more likely to vote.
Democrats ultimately perform better with high-turnout groups, while Trump has made gains with relatively low-turnout groups such as young men and those without college degrees.
Trump, for example, holds a huge lead among those who were registered but didn’t vote in 2020, according to a New York Times/Siena poll.
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A key question, then, is whether they will show up this time.
5. She’s raised – and spent – more money
It’s no secret that American elections are expensive, and 2024 is on track to be the most expensive ever.
But when it comes to spending power – Harris is on top. She’s raised more since becoming the candidate in July than Trump has in the entire period since January 2023, according to a recent Financial Times analysis, which also noted that her campaign has spent almost twice as much on advertising.
This could play a role in a razor-tight race that will ultimately be decided by voters in swing states currently being bombarded by political ads.
Kamala Harris, the current vice-president, is the candidate for the Democratic Party. She joined the race after President Joe Biden dropped out and no other Democrats stood against her.
There are also some independent candidates running for president. One of the most prominent was Robert F Kennedy Jr, but he suspended his campaign in August and backed Trump.
The Democrats are the liberal political party, known for supporting civil rights, a social safety net and measures to address climate change.
In the 2024 election, issues highlighted by Harris include tackling the cost-of-living crisis and supporting abortion rights.
The Republicans are the conservative political party. They have stood for lower taxes, shrinking the size of the government and gun rights.
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Issues Trump has campaigned on include tackling illegal immigration and ending inflation to “make America affordable again”.
How does the US presidential election work?
The winner is not the person who gets the most votes overall.
Instead, both candidates compete to win contests held across the 50 states.
Each state has a certain number of so-called electoral college votes, partly based on population. There are a total of 538 up for grabs and the winner is the candidate that gets 270 or more.
All but two states have a winner-takes-all rule, so whichever candidate has the highest number of votes is awarded all of its electoral college votes.
Most states lean heavily towards one party or the other, so the focus is on about seven states where either of them could win. These are known as the battleground or swing states.
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It is possible for a candidate to win the most votes nationally – like Hillary Clinton did in 2016 – but still be defeated.
Most US citizens aged 18 or over are eligible to vote.
Each state has its own voter registration process and deadline.
Who else is being elected in November?
All of the attention will be on who wins the presidency, but voters will also be choosing new members of Congress – where laws are passed – when they fill in their ballots.
Congress consists of the House of Representatives, where all 435 seats are up for election, and the Senate, where 34 seats are being contested.
Republicans currently control the House, which initiates spending plans. Democrats are in charge of the Senate, which votes on key appointments in government.
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These two chambers pass laws and can act as a check on White House plans if the controlling party in either chamber disagrees with the president.
When will we know who has won the election?
Usually the winner is declared on the night of the election, but in 2020 it took a few days to count all the votes.
The period after the election is known as the transition, if there is a change of president.
This gives the new administration time to appoint cabinet ministers and make plans for the new term.
The president is officially sworn into office in January in a ceremony known as the inauguration, held on the steps of the Capitol building in Washington DC.
American voters go to the polls on 5 November to choose their next president.
US election results have sometimes been declared within hours of the polls closing, but this year’s tight contest could mean a longer wait.
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When is the 2024 presidential election result expected?
In some presidential races the victor has been named late on election night, or early the next morning. This time, the knife-edge race in many states could mean media outlets wait longer before projecting who has won.
Democrat Kamala Harris, the current vice-president, and Republican Donald Trump, the former president, have been running neck-and-neck for weeks.
Narrow victories could also mean recounts. In the key swing state of Pennsylvania, for example, a state-wide recount would be required if there’s a half-percentage-point difference between the votes cast for the winner and loser. In 2020, the margin was just over 1.1 percentage points.
0:53BBC’s Sumi Somaskanda explains when a new president will be announced
Legal challenges are also possible. More than 100 pre-election lawsuits have already been filed, including challenges to voter eligibility and voter roll management, by Republicans.
Other scenarios that could cause delays include any election-related disorder, particularly at polling locations.
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On the other hand, vote-counting has sped up in some areas, including the crucial state of Michigan, and far fewer votes will be cast by mail than in the last election, which was during the Covid pandemic.
When have previous presidential election results been announced?
The 2020 election took place on Tuesday 3 November. However, US TV networks did not declare Joe Biden the winner until late morning on Saturday 7 November, after the result in Pennsylvania became clearer.
In other recent elections, voters have had a much shorter wait.
In 2016, when Trump won the presidency, he was declared the winner shortly before 03:00 EST (08:00 GMT) the day after the election.
In 2012, when Barack Obama secured a second term, his victory was projected before midnight on polling day itself.
However, the 2000 election between George W Bush and Al Gore was a notable exception.
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The vote was held on 7 November, but the two campaigns went to war over a tight contest in Florida and the race was not decided until 12 December. The US Supreme Court voted to end the state’s recount process, which kept Bush in place as winner and handed him the White House.
What are the key states to watch in 2024?
Across the country, the first polls will close at 18:00 EST (23:00 GMT) on Tuesday evening and the last polls will close at 01:00 EST (06:00 GMT) early on Wednesday.
But this race is expected to come down to results from seven swing states. These are Arizona, Georgia, Michigan, Nevada, North Carolina, Pennsylvania and Wisconsin.
Polls close at different times in different regions. State-specific rules could prolong counting in some states, while other states may report partial figures moments after the last in-person vote is cast. Also, some absentee and mail-in ballots, including votes by members of the military and Americans living overseas, are normally among the last to be counted.
Georgia – Polls close in the Peach State at19:00 EST (00:00 GMT). Early and mail-in ballots will be counted first, ahead of in-person votes. Georgia’s top election official estimates that about 75% of votes will be counted within the first two hours, with a full tally possible expected by later in the night.
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North Carolina – Polls close thirty minutes after Georgia. North Carolina’s results are expected to be announced before the end of the night, however, complications may arise in areas that were hit by a hurricane in September.
Pennsylvania – Voting ends at 20:00 EST (01:00 GMT) in the Keystone State – the crown jewel of all the swing states in this election cycle. Like Wisconsin, Pennsylvania does not allow counting to begin until the morning of the election, leading to an expected delay in results. Experts agree that it may take at least 24 hours before enough votes are counted for a winner to emerge.
Michigan – Voting concludes at 21:00 EST (02:00 GMT) in the Wolverine State. Michigan allows officials to begin counting votes one week before election day, but they are not allowed to reveal the results until these polls shut. Michigan’s top election official has said that a result should not be expected until the “end of the day” on Wednesday.
Wisconsin – Results should come in shortly after polls close at 21:00 EST for smaller counties. However, it often takes longer for major populations centres to tabulate votes, leading experts to predict that the state won’t have a result until at least Wednesday.
Arizona – Initial results could come as early as22:00 EST (03:00 GMT), however, they won’t paint a complete picture. The state’s largest county says not to expect results until early Wednesday morning. On top of that, postal ballots dropped off on election day could take up to 13 days to count, according to officials in Maricopa County, the largest district in the state.
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Nevada – Votes here could also take days to count, because the state allows mail-in ballots to qualify as long as they were sent on election day and arrive no later than 9 November.
Elon Musk’s political group can keep awarding $1m (£722,000) to voters in swing states, a judge has ruled.
The giveaway by Mr Musk’s America PAC is set to end on Tuesday, and the final recipient has already been determined, a lawyer for the billionaire said in a court hearing on Monday.
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In a surprising turn, the lawyer revealed that people receiving the money have not been chosen randomly in a lottery-style contest, as many believed, but were selected by the group.
Philadelphia District Attorney Lawrence Krasner had sued to stop what he called an “an illegal lottery” after Musk announced he would give the money to one voter in a swing state each day until Election Day.
Pennsylvania Judge Angelo Foglietta did not immediately give a reason for the ruling, made a few hours after the hearing, according to the Associated Press.
“The $1m recipients are not chosen by chance,” the lawyer, Chris Gober, said during the hearing, according to the Associated Press. “We know exactly who will be announced as the $1m recipient today and tomorrow.”
Mr Gober told the court that America PAC has already determined the final recipient will be a voter from Michigan, US media reported.
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On Monday, America PAC announced a man named Joshua in Arizona had been awarded the day’s sum.
In a post on X, formerly Twitter, which Mr Musk owns, the group added: “Every day until Election Day, a person who signs will be selected to earn $1m as a spokesperson for America PAC.”
But when the world’s richest man unveiled the giveaway last month, many believed it was a random drawing for registered voters who signed a petition supporting the First and Second Amendments of the US Constitution.
“We are going to be awarding $1m randomly to people who have signed the petition, every day, from now until the election,” Musk told a campaign event.
A few days later, the US justice department warned that the group could be breaking election laws, which forbid paying people to register to vote. Krasner’s office sued to stop it.
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Mr Musk has been aggressively campaigning for Republican White House candidate Donald Trump in swing states across the country, and his committee has been pushing hard in Pennsylvania, where polls suggest Trump is in a tie with his Democratic rival, Vice-President Kamala Harris.
A lawyer in Krasner’s office told Reuters that Mr Gober’s comments in court were “a complete admission of liability”.
During the hearing, prosecutors played a video where Mr Musk, who is also the chief executive of SpaceX, said that “all we ask” is that the winners serve as spokespeople for the group, Reuters reported.
But Chris Young, the director of America PAC, said in court that the recipients are screened and must have values aligned with the group, US media reported.
Those who receive the money sign non-disclosure agreements that block them from publicly discussing the terms of their contracts, according to Reuters.
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Mr Musk did not attend Monday’s hearing.
Also on Monday, Joe Rogan released an episode of his podcast featuring a nearly three-hour interview with Mr Musk.
In a post promoting the podcast on X, he said he would be endorsing former President Donald Trump.
“He [Musk] makes what I think is the most compelling case for Trump you’ll hear, and I agree with him every step of the way,” Rogan wrote.