There was one aspect that dampened Humboldt’s joy: the slave market opposite their rented house, in Cumaná’s main square. Since the early sixteenth century the Spanish had imported slaves to their colonies in South America and continued to do so. Every morning young African men and women were put on sale. They were forced to rub themselves with coconut oil to make their skin shiny black. They were then paraded for prospective buyers, who jerked open the slaves’ mouths to examine their teeth like ‘horses in a market’. The sight made Humboldt a life-long abolitionist.
Whenever I see things like this it reminds me what nonsense the argument is that implies that people of the time weren't capable of "modern" moral thoughts around human rights
