"""Participants in a naturalization ceremony wave flags after taking the """"Oath of Allegiance"""" at an event attended by President Barack Obama at the National Archive in Washington, Tuesday, Dec. 15, 2015. The president spoke at the National Archives Museum, where 31 immigrants from Iraq, Ethiopia, Uganda and 23 other nations are being sworn in as U.S. citizens. (AP Photo/Evan Vucci)"""
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