I searched long time on the Internet this postcard, but I couldn't find it, so I don't know why gathered all these people on this canal in Amsterdam. Anyway, it must be something with national spirit, because so many wears orange shirts. For those who don't know, orange is the color of the Dutch Royal Family, but today it symbolizes a broader pride in the country and in being Dutch. The lineage of the current dynasty - the House of Oranje-Nassau - dates back to Willem van Oranje (William of Orange). It is possible that the photograph to have been done with the ocasion of Koningsdag (King's Day), celebrated on 27 April (26 April if the 27th falls on a Sunday) to mark the birth of King Willem-Alexander. This day is an opportunity for "orange madness" or oranjegekte, for the national colour, when the normally strait-laced Dutch let down their hair, often dyed orange for the occasion.
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