Polls opened at 06:00 on the East Coast (11:00) GMT, though three New Hampshire villages voted soon after midnight
- Both Hillary Clinton and Donald Trump voted early on Tuesday
- Results are expected towards midnight (05:00 GMT on Wednesday) once polls close on the West Coast
- A BBC poll of polls puts the Democratic candidate ahead by four points
- More than 45 million voters cast their ballots early ahead of election day
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