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's return to office won't have told David Cameron anything new about running for re-election. But it won't help Labour either...
– Former US Secretary of State Condoleezza Rice
Americans can take pride in last night's peaceful exercise of our democratic right to choose those who will lead us. We are one country, united in our beliefs and our values.
Let us pray for wisdom and courage for our President and all who were elected to office last night. God Bless America.
This is the fifth time in six elections that Republicans has failed to win the popular vote, and that raises questions for the party.
ITV News' International Editor Bill Neely reports from Boston:
Barack Obama has arrived at his campaign headquarters in Chicago to thank party workers before he heads back to Washington, Reuters' White House correspondent has reported.
President Obama has called the Congressional leaders of both the Republican and Democrat parties after his victory, a White House spokesperson said.
The President said the American people want the two sides to work together.
Obama faces a Republican majority in Congress.
Herman Cain, who lost to Mitt Romney for the Republican's presidential nomination, has issued a harsh warning to Obama voters in the wake of the President's re-election.
People who voted for Obama have No Clue what we're in for in terms of unemployment. No Clue. #TCOT
US Senate Majority Leader Harry Reid has said last night's election results show the American people want a balanced approach to deficit reduction and tax policy, Reuters has reported.
Senator Reid called for bipartisan cooperation, saying he will negotiate with Republicans "any time, any issue."
We have to sit down and go to work on it now, not wait. This was really the message the American people sent.
Congrats to @barackobama winning 2nd term. Hope all parties can find common ground & move forward. Historic opportunities lay ahead for US
Boris Johnson has congratulated Barack Obama on his re-election, but has also reignited his battle with the US Embassy in London over unpaid Congestion Charge fines:
Many congratulations to @barackobama on his victory. Looking forward to renewing our claim to America's unpaid Congestion Charge bill!