The winner of the election is determined through a system called the electoral college. Each of the 50 states, plus Washington DC, is given a number of electoral college votes, adding up to a total of 538 votes. More populous states get more electoral college votes than smaller ones.
A candidate needs to win 270 electoral college votes (50% plus one) to win the election.
In every state except two Maine and Nebraska the candidate that gets the most votes wins all of the states electoral college votes.
Due to these rules, a candidate can win the election without getting the most votes at the national level. This happened at the last election, in which Donald Trump won a majority of electoral college votes although more people voted for Hillary Clinton across the US.
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Trump refuses to concede as Biden wins, with a 6m advantage in the popular vote
