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The 2009 Nobel Peace Prize was awarded to United States President Barack Obama for his "extraordinary efforts to strengthen international diplomacy and cooperation between peoples". The Norwegian Nobel Committee announced the award on October 9, 2009, citing Obama's promotion of nuclear nonproliferation and a "new climate" in international relations fostered by Obama, especially in reaching out to the Muslim world.

2009 Nobel Peace Prize
Barack Obama with the Nobel Prize.
U.S. President Barack Obama receiving the 2009 Nobel Peace Prize

The 2009 Nobel Peace Prize was awarded to United States President Barack Obama for his "extraordinary efforts to strengthen international diplomacy and cooperation between peoples". The Norwegian Nobel Committee announced the award on October 9, 2009, citing Obama's promotion of nuclear nonproliferation and a "new climate" in international relations fostered by Obama, especially in reaching out to the Muslim world.

The Nobel Committee's decision drew mixed reactions from US commentators and editorial writers across the political spectrum, as well as from the rest of the world.

Obama accepted the prize in Oslo on December 10, 2009. In a 36-minute speech, he discussed the tensions between war and peace and the idea of a "just war" saying, "perhaps the most profound issue surrounding my receipt of this prize is the fact that I am the Commander-in-Chief of the military of a nation in the midst of two wars."

Obama is the fourth President of the United States to have been awarded a Nobel Prize (after Theodore Roosevelt, Woodrow Wilson and Jimmy Carter, with Carter's honor happening after leaving office).