One of the most contentious presidential campaigns in US history comes to an end Tuesday, when the question of who will hold the country's highest office is put in the hands of voters.
Americans will begin casting ballots when polling sites open in several eastern states at 6 am (1100 GMT). This year, however, with more states allowing early voting, millions have already made their choice.
Former secretary of state Hillary Clinton headed into election day with most opinion polls favouring her to become the first woman in US history elected president.
Clinton's opponent is Republican Donald Trump, a New York real estate developer and billionaire with no political experience.