Slavery, ethnic cleansing, genocide, mass murder, torture and civil war are the legacy of colonisation.
This really isn't true, you know. It will remain untrue no matter how many people confidently assert it on tiktok.
There's a reason we no longer share Earth with Neanderthal humans, for instance. Yes, many humans have some residual DNA, so there was some inbreeding, but mostly we wiped them out.
Slaves built the pyramids.
Plenty of evidence of torture as an instrument of social control that pre-dates colonialism, or has nothing to do with it, eg the Spanish Inquisition, and it was standard in England at the time as well.
Civil war, I mean there have been plenty of civil wars in England alone that pre-date colonialism.
There's a current trend of thinking white Western cultures are the root of all evil but it's nonsense. It's actually a deeply racist way of thinking, assuming that non-Western cultures are childlike beings with no agency of their own.