This description of the meteorite that killed the dinosaurs is a bit sobering.

[Burney]

I think we can only go back to the advent of the slave trade, sc.

whats that 1750ish?

Which slave trade, i? There was the Arab slave trade (which pre-dated ours by some centuries) and then the Portugee and the Spaniards were at it long before we got in on the act.

What you mean, of course, is that it should date from the involvement of white, English-speaking males (Boo! Hiss!, etc) in doing slavery, which can basically be traced to the foundation of the Royal African Company in (I think) 1660-1670-ish? No other slavery before that counts.