"National Black Cat Day was created by Cats Protection on 27 October 2011 to help celebrate the majesty of monochrome moggies and beautiful black cats. When the campaign was launched, statistics revealed that black and black-and-white cats took, on average, seven days longer to find a home compared to cats of other colours."
Black cats of all nationalities are welcome :) The charity that declared the day is from the UK, but the idea that "black cats are beautiful and shouldn't be overlooked" is worldwide :)