U.S. President Barack Obama (R) waves to the audience with First Lady Michelle Obama after delivering his farewell address in Chicago, Illinois, United States of America on Jan, 10, 2017. (Xinhua/Shen Ting)
U.S. President Barack Obama (R) waves to the audience with First Lady Michelle Obama after delivering his farewell address in Chicago, Illinois, United States of America on Jan, 10, 2017. (Xinhua/Shen Ting)
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