All eyes on early vote results in key swing state of Georgia
· BBC NewsJude Sheerin
BBC News, Washington
Early results could be released soon in the key swing state of Georgia as polls begin closing in the race to see whether Donald Trump or Kamala Harris will be the next US president.
As expected, Trump has won in Kentucky and Indiana, while Kamala Harris has taken Vermont, the BBC's US partner, CBS, is projecting.
The first wave of exit polls has been released, with voters naming the state of democracy and the economy as the most important issues for them.
Whichever way it goes the result will be historic - either giving America its first woman president or marking a seismic political comeback for Trump.
A high turnout has been predicted, but the outcome may not be known for several days if the results are as close as polls have indicated.
Whoever wins the White House may have their hands tied by Congress, which is also up for grabs in Tuesday’s vote.
Democrats have a slim majority in the Senate, while Republicans narrowly control the House of Representatives.
Republicans took a step towards winning control of the Senate on Tuesday night by wresting a seat in West Virginia from the Democrats.
But neither party seemed to have an advantage in the House.
Polls have closed in Georgia, North Carolina and Pennsylvania - three of the seven swing states expected to determine the outcome. The others are Arizona, Michigan, Nevada and Wisconsin.
Georgia Secretary of State Brad Raffensperger said that by new state law, early votes in the Peach State are required to be publicly reported one hour after polls close.
"You'll get a lot of results really quick," he said.
Around 86 million voters cast their ballots early amid one of the most turbulent campaigns in recent American history.
Vice-President Harris, 60, only became the Democratic Party candidate in July, after President Joe Biden withdrew from the race under pressure from within the party.
Trump, 78, was the subject of two assassination plots - narrowly avoiding a sniper's bullet in Pennsylvania.
The former president said he felt "very confident" as he voted earlier in the day near his home in Palm Beach, Florida, with his wife, Melania.
"If I lose an election, if it's a fair election, I'm going to be the first one to acknowledge it," he said.
Elon Musk, the world's richest man and Trump mega-donor, is spending election night with the Republican nominee at his Mar-a Lago resort in Florida.
Harris, who voted early by mail in her home state of California, is due later to address students at Howard University, a historically black college in Washington DC, where she was an undergraduate.
"To go back tonight to Howard University, my beloved alma mater, and be able to hopefully recognise this day for what it is is really full circle for me," Harris said on a radio interview earlier.
If she wins, she would become the first woman, black woman and South-Asian American to win the presidency.
Trump, who is the only president to be impeached twice and the first former president to be criminally convicted, would become the first president to win non-consecutive terms in more than 130 years.
The first exit polls have been released, looking at the issues motivating Americans, but not directly asking who they voted for.
Polling by the BBC's partner network, CBS, suggests that around a third of people said the state of democracy was their top concern, out of the five options given.
The economy ranked second, with three in 10 voters choosing it, according to the preliminary data.
Abortion and immigration followed on the list, while foreign policy was deemed the least important.
In Detroit, Michigan, one voter, Melissa Klein, told the BBC: "Women's rights are a huge, huge issue for me. I'm a nurse, I work in obstetrics, I'd never want to see a world where we can't help women get the life-saving work they need."
In Las Vegas, Nevada, first-time voter Jasmine Perez, 26, said she had cast her vote for Trump.
"What really attracted me to Donald Trump is I'm a Christian," Ms Perez told AP news agency. "I like that he openly promotes Christianity in America."
Law enforcement agencies nationwide are on high alert for potential violence.
About 30 bomb threats hoaxes targeted election-related locations nationwide on Tuesday, more than half of them in the state of Georgia alone, reports CBS.
Both sides have armies of lawyers on standby for legal challenges on and after election day.
SIMPLE GUIDE: How to win the electoral college
RESULTS: When will we know who has won?
EXPLAINER: What Harris or Trump would do in power
GLOBAL: How this election could change the world
IN PICS: Different lives of Harris and Trump
BBC COVERAGE: How to follow the US election on the BBC