Answer:
According to the picture, the artist seems to see slave marketting as a bad thing. They illustrated the picture to show that slave marketting is where they take slaves and they sell them to future slave owners. You can see that they are tied representing that the artist is saying that they won't let anything happen to the slaves so that they cannot escape. The title says "Captured Africans bound for the slave market" No wonder they're tied, the artists is saying that whatever African person is captured cannot escape and WILL be sold.
Step-by-step explanation: