If the option is there, then the Slave Trade.
Can you please add more detail to that question I'm not 100% sure what you mean. Sorry.
Answer: 1. Treaty of versailes
Explanation: Treaty of versailes was a peace treaty which brought world war 1 to an end
The cotton gin lead to a rise in slavery because it made it much easier to extract the seeds from the cotton that was grown in the fields, which meant that farmers were able to plant and grow more and more cotton, which led to a rise in demand for slaves would would work the vastly expanding cotton fields.