European Leaders Commemorate The 100th Anniversary of World War I In Belgium [Getty Images]

YPRES, BELGIUM - JUNE 26: In this handout photo provided by the German Government Press Office (BPA), (L-R) British Prime Minister David Cameron, French President Francois Hollande and German Chancellor Angela Merkel attend a commemoration ceremony to mark the 100th anniversary of the start of World War I at the Menin Gates in Ypres, Belgium. (Photo by Guido Bergmann/Bundesregierung via Getty Images)

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