You might be interested in some previous threads about about the slavery both ancient and modern/early modern:

Comparing the Ancient and the Atlantic Slave Trade

• " it should be noted that slavery in the ancient Roman Empire was closer to the modern-day employer-employee relationship, not the slavery of other eras based on kidnapping and racism" some biblical scholar - 47 comments, over 2 years old.
• Specialists on both eras involved engage in comparisons and debate on ancient and early modern slavery.
• "I don't think that ancient slavery is really comparable to the chattel slavery that we saw in the Americas." How did ancient slavery differ from the atlantic slave trade? - 91 comments, over 6 months old.
• This thread is mostly about Roman slavery including how slaves were acquired, what they were used for, and what ethnicity/race they were and thus allowing comparison with the situations presented in the threads above.

The Atlantic Slave Trade and Racism

• Did Racism Cause the Enslavement of Africans? - 2 comments, over 2 months old.
• The commenters here summarize the matter without going into detail.
• Do you think racism was the result of slavery? or whether africans were enslaved because of racism? - 7 comments, over 8 months old.
• The commenters here go into detail on the genesis of racism in the US from the Thirteen Colonies to the Antebellum United States.
• Why did Europeans enslave Africans instead of other Europeans? - 17 comments, over 2 months old.
• The commenters here go into the difficulties involved in enslaving people in Europe to compare and contrast with the methods used in Africa as well as going into developing attitudes towards race in the Early Modern era.
• How true is the claim that "racism created race", as opposed to the other way around? - 9 comments, over 6 months old.
• This thread brings up and summarizes the a book with a contrary claim to the traditional narrative that modern racism primarily derives from the Early Modern era.

I think i was reffering to the idea of a anctient slave trade that goes across state boundries, I knew about slavery in ancietn rome, egpyt and greece. I just didn`t about the trans contiental slave trade. I problaby should have worded it better.