Slavery was brought on by the advent of agriculture, 12,000 years ago. Humans (homo sapiens) have existed for 300,000 years. 12,000/300,000x100=
4% of our species existence
Capitalism itself has only existed for about 300 years, a figure so trivial it isn’t even worth calculating.
It gets really murky depending on what the definition of human is, which isn’t easy to answer. Tool-using hominids have been around for ~3M years, and fire-cookers for ~1.5M years.
This is true