Never said “invented”. They did it nevertheless.
I have read that the Arabs were probably the first slave-holders. Then there’s this:
Using the Bible to justify slavery. Slavery in the Bible and early Christianity.
http://www.religioustolerance.org/chr_slav1.htm
Ok, then. If that is your standard, then Mao and Pol Pot engaged in mass-murder communism. The European Marx might have invented it, but those two elevated it to wholesale slaughter - in Asia, by Asians.
There is far more religious strife in India than there is in the United States. We don't have Christians engaged in wide-scale attacks on Hindus here, but Hindu attacks on Christians in India has been rising over the last 20 years.
Want historical genocide by Asians? Try Tamurlane. Just one of hundreds of examples if you bother to do more than just regurgitate left-wing historical bile against European history.
White people created the movement to abolish slavery worldwide. This upsets people like the Muslims, who regard slavery as an institution sanctioned by Allah.