NBC reports it is too early to call the result in the state of Minnesota, where 10 electoral votes are up for grabs.
Now Barack Obama has secured four more years in the White House he must tackle the growing list of challenges facing America.
While both parties called for unity in Barack Obama's second term to solve the USA's problems, Mark Austin found voters fearful of gridlock.
Barack Obama has secured re-election as President on a night of drama in America. Here are the best pictures from election night: