President Barack Obama has been re-elected to a second term, defeating Republican challenger Mitt Romney.
With most US states reporting results, America’s first black president has won a majority of electoral votes.
Mr Obama prevailed despite lingering dissatisfaction with the economy and a well-funded challenger in Mr Romney, a former governor of Massachusetts.
Obama became only the second Democrat to win a second four-year White House term since World War II, when television networks projected he would win the bellwether state of Ohio where he had staged a pitched battle with Romney.
“This happened because of you. Thank you,” Obama tweeted to his 22 million followers on Twitter as a flurry of states, including Iowa, which nurtured his unlikely White House dreams suddenly tipped into his column.
With a clutch of swing states, including Florida and Virginia still to be declared, Obama already had 275 electoral votes, more than the 270 needed for the White House and looked set for a comfortable victory.
There was a sudden explosion of jubilation at Obama’s Chicago victory party as the first African American president, who was elected on a wave of hope and euphoria four years ago, booked another four years in the White House.