BERLIN - NOVEMBER 09:  German Chancellor Angela Merkel (L) greets U.S Secretary of State Hillary Clinton at the Chancellery on November 9, 2009 in Berlin, Germany. Clinton is in Berlin to participate in celebrations marking the 20th anniversary of the fall of the Berlin Wall, which led to the end of communist rule in East Germany and the reunification of East and West Germany later on. Getty Images logo Getty Images 27 months ago

BERLIN - NOVEMBER 09: German Chancellor Angela Merkel (L) greets U.S Secretary of State Hillary Clinton at the Chancellery on November 9, 2009 in Berlin, Germany. Clinton is in Berlin to participate in celebrations marking the 20th anniversary of the fall of the Berlin Wall, which led to the end of communist rule in East Germany and the reunification of East and West Germany later on.