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TERNEUZEN, NETHERLANDS - AUGUST 31: King Willem-Alexander of The Netherlands, Queen Maxima of The Netherlands, King Philippe of Belgium and Queen Mathilde of Belgium attend the 75th anniversary of the liberation of The Netherlands in Zeeland on August 31, 2019 in Terneuzen, Netherlands. (Photo by Patrick van Katwijk/Getty Images)

TERNEUZEN, NETHERLANDS - AUGUST 31: King Willem-Alexander of The Netherlands, Queen Maxima of The Netherlands, King Philippe of Belgium and Queen Mathilde of Belgium attend the 75th anniversary of the liberation of The Netherlands in Zeeland on August 31, 2019 in Terneuzen, Netherlands. (Photo by Patrick van Katwijk/Getty Images)