US Election 2020: Americans choose between Trump and Biden
Americans are voting in one of the most divisive presidential elections in decades, pitting incumbent Republican Donald Trump against his Democratic challenger Joe Biden.
The first polls opened from 05:00 EST (10:00 GMT) in Vermont.
Nearly 100 million people have already cast their ballots in early voting, putting the country on course for its highest turnout in a century.
Both rivals spent the final hours of the race rallying in key swing states.
National polls give a firm lead to Mr Biden, but it is a closer race in the states that could decide the outcome.
Among the first states to begin election-day voting on Tuesday are the key battlegrounds of North Carolina and Ohio (11:30 GMT), followed half an hour later by Florida, Pennsylvania, Georgia, Michigan and Wisconsin. Arizona will follow at 13:00 GMT.
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 - like Hillary Clinton did in 2016 - but still lose the election.
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