U.S. President Barack Obama signs two Presidential Memoranda associated with his Executive Actions on immigration from his office on Air Force One upon his arrival in Las Vegas, Nevada November 21, 2014. Obama imposed the most sweeping immigration reform in a generation on Thursday, easing the threat of deportation for about 4.7 million undocumented immigrants and setting up a clash with Republicans.
REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS SOCIETY IMMIGRATION TPX IMAGES OF THE DAY)