In just one month about 150mn Americans will vote for Democratic vice-president Kamala Harris or Republican Donald Trump to be US president. Both say the election is the most important in the country’s history.
But the winner of the popular vote does not necessarily win the White House. The US’s unique Electoral College system means that slates of electors from the states decide the winner. But most states vote reliably Democratic or Republican. Only a few are prone to switching — the so-called swing states.
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