“All Indians are free, not one of them is a slave”- Megasthenes, Greek Ambassador to Ancient India. Slave trade was brought to India by invading Islamic armies & more Hindus were enslaved than Africans. Shivaji abolished the slave trade in his kingdom 186 years before USA.
“All Indians are free, None of them is a slave. Indians do not even use foreigners as slaves, much less a countryman of their own” - Indica of Arrian (quoting Megasthenes. translated by McCrindle).
Every foreign traveler until the 10th century made the same observation.