Donald Trump and Hillary Clinton have been criss-crossing America in a final drive for votes.
Mrs Clinton urged voters to back a “optimistic, inclusive, big-hearted America” while Mr Trump told supporters they had a “brilliant chance to overcome the tainted system”.
A record number of Americans – more than 46m – have voted early by post or at polling stations.
There are hints of a high turnout among Hispanic voters, which is believed to favour Mrs Clinton.
It was after midnight when the rivals held the closing rallies of their campaigns – Mr Trump Michigan, in Grand Rapids, and Mrs Clinton in Raleigh, North Carolina.
“Now the American working class is going to strike back, eventually,” said Mr Trump, pledging to reverse job losses.
Mrs Clinton told her audience that they didn’t “need to accept a dark and divisive vision of America”.
