Number Six from "6 Common Misconceptions About the Enslavement of African People" in The Atlanta Black Star:
In Atrocities: The 100 Deadliest Episodes in Human History, author Matthew White listed the Mideast slave trade (7th to 19th century) at 18.5 million deaths, and the toll of the Atlantic slave trade (1452–1807) at 16 million. That amounts to 34.5 million deaths of one single group of people.
That estimate does not account for the deaths as a result of the practice of slavery across the Diaspora, which ended in Brazil in 1888. Nor does it account for the centuries of colonialism across the continent.
Whites might want to keep that in mind whenever they feel like saying "get over it"...