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DUESSELDORF, GERMANY - AUGUST 23: Prince William, Duke of Cambridge and German Chancellor Angela Merkel attend the celebrations of the 70th anniversary of North Rhine-Westphalia on August 23, 2016 in Duesseldorf, Germany. North Rhine-Westfalia was founded by the British military administration 70 years ago today. (Photo by Andreas Rentz/Getty Images)

DUESSELDORF, GERMANY - AUGUST 23:  Prince William, Duke of Cambridge and German Chancellor Angela Merkel attend the celebrations of the 70th anniversary of North Rhine-Westphalia on August 23, 2016 in Duesseldorf, Germany. North Rhine-Westfalia was founded by the British military administration 70 years ago today.  (Photo by Andreas Rentz/Getty Images)