FILE - In this Oct. 3, 1990, file photo, a huge German flag waves in front of the Reichstag building in Berlin after it was hoisted to celebrate the unification of Germany. Germany marks a quarter-century as a reunited nation on Saturday, Oct. 3, 2015, with two leaders from the formerly communist east heading a country that increasingly asserts itself as Europe’s political heavyweight, and now faces a new challenge in a refugee influx that will demand deep reserves of resourcefulness and patience. (AP Photo/Heribert Proepper)