World Map of Reasons for National Holiday based on data at <a rel="nofollow" class="external free" href="https://www.washingtonpost.com/blogs/worldviews/wp/2013/02/26/a-surprising-map-of-the-worlds-national-holidays-only-two-countries-have-no-national-day/">https://www.washingtonpost.com/blogs/worldviews/wp/2013/02/26/a-surprising-map-of-the-worlds-national-holidays-only-two-countries-have-no-national-day/</a> .
cmglee, Canuckguy and many others
CC BY-SA 3.0
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