US election day: what to expect

US election day is finally here, and 100 million people have already voted by mail or in person. Millions more were to vote in person on Tuesday, and the winner — Republican President Donald Trump or Democratic challenger Joe Biden — won’t be known until the evening at the earliest. But the battle to achieve a majority 270 electoral votes, earned by winning the popular vote in individual states, has been so close that knowing the winner could…