US President Donald Trump and his Democratic challenger Joe Biden have spent the final hours of the White House race delivering their closing pitch to voters in critical states.
Mr Biden campaigned in Pennsylvania and Ohio, as Mr Trump toured the voting battlegrounds of Wisconsin, Michigan, North Carolina and Pennsylvania.
National polls suggest a firm lead for Mr Biden in Tuesday‚Äôs election.
But his lead is narrower in the handful of states that could decide the result.
Nearly 99 million people have already cast their ballots in early voting, putting the country on course for its highest turnout in a century.
In the US election, voters decide state-level contests rather than an overall single national one.
To be elected president, a candidate must win at least 270 votes in what is called the electoral college. Each US state gets a certain number of votes partly based on its population and there are a total of 538 up for grabs.
This system explains why it is possible for a candidate to win the most votes nationally ‚Äď like Hillary Clinton did in 2016 ‚Äď but still lose the election.
Tuesday‚Äôs vote comes amid the ongoing coronavirus pandemic. The US has recorded more cases and more deaths than any other country worldwide, reporting more than 81,000 new infections on Sunday alone.
As the nation counts down the hours to the vote, there are fears that pockets of post-election violence could break out. Businesses in the nation‚Äôs capital, Washington DC, and in New York City have been seen boarding up their premises due to concerns about unrest.
Where were Biden and Trump on campaign‚Äôs final day?
After a punishing schedule of rallies in six states on Sunday, President Trump sprinted through four more battleground states on Monday.
In North Carolina, he told supporters that ‚Äúnext year will be the greatest economic year in the history of our country‚ÄĚ. The rally was postponed from Thursday due to Hurricane Zeta.
He touted numbers that he says ‚Äúnobody even thought possible‚ÄĚ.
The US economy saw record-breaking 33% growth in the third financial quarter of this year, following a record 31% contraction in the second. Economists warn the damage inflicted by the pandemic ‚Äď the biggest decline in the US economy in more than 80 years ‚Äď could still take years to overcome.
After North Carolina, Mr Trump headed to Scranton, Pennsylvania, the city where his opponent lived until he was 10. At a rally there he reminded his supporters that he won the state in 2016 despite polls suggesting he would lose.
Mr Biden also went to Pennsylvania where he was joined by singer Lady Gaga at a rally in Pittsburgh. Musician John Legend addressed voters with vice-presidential candidate Kamala Harris.
At a last-minute campaign stop in Ohio, Mr Biden repeated the core message of his campaign, telling voters that the race was about the soul of America. He said it was time for Mr Trump to ‚Äúpack his bags‚ÄĚ, saying ‚Äúwe‚Äôre done with the tweets, the anger, the hate, the failure, the irresponsibility‚ÄĚ.
The race in Ohio is extremely tight. In 2016, Mr Trump won by more than eight points ‚Äď currently, he has a 0.2% lead over Mr Biden, according to an aggregate of polls by RealClearPolitics.
On Monday, Mr Trump also held rallies in Traverse City, Michigan, and Kenosha, Wisconsin. Kenosha was rocked by violent protests in August after the police shooting of a black man.
In Traverse City he asked for the votes of black Americans.
He travelled to Grand Rapids, Michigan for his last rally, the same city where he held the final event of the 2016 election race.
On Sunday¬†the candidates attacked each other on two of this campaign‚Äôs key themes¬†‚Äď Covid-19 and racial tension.
The president and his campaign have meanwhile indicated they will sue to block the potentially pivotal state of Pennsylvania from counting postal ballots received three days after the election.
The US Supreme Court allowed a lower court ruling granting the extended deadline to stand, but several conservative justices signalled they might be open to revisiting the issue after the vote.
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