Trump v Harris: millions vote in election hinging on key state battles

America and the world has its reckoning with the ballot box today.

After an enormously expensive election campaign, at a time when many Americans are feeling the pinch economically, the polls suggest this will be an historically close contest.

But polls can be wrong – especially given the margin of error.

It all hinges on a few undecided voters in a few key swing states – and which party can bring their supporters out to vote.