March 25, 2015 - International Day of Remembrance of the Victims of Slavery and the Transatlantic Slave Trade.

UN to unveil permanent memorial in New York honouring victims of transatlantic slave trade

"For over 400 years, more than 15 million men, women and children were the victims of the tragic transatlantic slave trade, one of the darkest chapters in human history.

Every year on 25 March, the International Day of Remembrance for the Victims of Slavery and the Transatlantic Slave Trade offers the opportunity to honour and remember those who suffered and died at the hands of the brutal slavery system. The International Day also aims at raising awareness about the dangers of racism and prejudice today.

In order to more permanently honour the victims, a memorial will be erected at United Nations Headquarters in New York. The winning design for the memorial, The Ark of Return Video by Rodney Leon, an American architect of Haitian descent, was selected through an international competition and announced in September 2013."

Form the UN website

 I'd have to say the numbers are off by quite a bit. There are presently many more millions than 15, who are victims today of the effects of the Transatlantic slave trade. In North, South and Central America many multitudes still suffer the social and economic hardships brought on by this travesty.  Not to mention the cost to Africa itself, due to the loss of so many potential contributors to her legacy.