The origins of slavery are lost to human memory. It is sometimes hypothesized that at some moment it was decided that persons detained for a crime or as a result of warfare would be more useful if put to work in some way rather than if killed outright and discarded or eaten. But both if and when that first occurred is unknown. Slavery is known to have existed as early as the Shang dynasty 18th—12th century bce in China.
Caught in the net: slavery on Southeast Asian seas
Slavery will never be history as long as we turn a blind eye to China | China | The Guardian
So successful has the overdue moment of reckoning been that Hollywood and the leaders of American capitalism have embraced anti-racism. Do not let a leftish sneer form on your lips. Causes only win when the likes of Tim Cook endorse them. The parallels with the antebellum south reach to the cotton fields. XPCC sends forced labour to pick cotton because no one has ever picked cotton unless poverty or slave masters forced them to.
An overview on slavery which has existed all throughout Asia. Although slavery has been abolished in every  country, some forms of it still exist today. The early Arab invaders of Sind in the 8th century, the armies of the Umayyad commander Muhammad bin Qasim , are reported to have enslaved tens of thousands of Indian prisoners, including both soldiers and civilians.
Slavery in China has taken various forms throughout history. Slavery was abolished as a legally recognized institution, including in a law   fully enacted in ,  although the practice continued until at least The Chinese term for slave nuli can also be roughly translated into 'debtor', 'dependent', or 'subject'. Slaves in China were a very small part of the population and could include war prisoners, kidnap victims or people who had been sold.