Barring another surprise "event," the coming US presidential showdown is likely to be a duel between former President Donald Trump and Vice-President Kamala Harris.

That duel, if it goes through, will include a number of new features.

Harris is only the second woman to reach the last round in a US presidential contest. She is also the first "black" woman of Indian and Jamaican background to reach the penultimate rung of the ladder.

There are novelties on Trump's side as well.

On...