How did the institution of slavery change in the course of the triangle trade and colonialism?

The Slavs have all been manufactured from Africa rather than just South America.  A further explanation is given below.

Explanation:

Ships sail from Liverpool but instead Bristol, United Kingdom, loaded with the most created to enhance throughout Africa, including certain pots, trousers, firearms, and white wine. Because once ships approach Africa, this same commander would then sell those other goods to street vendors, as well as the boats have been reconfigured to take some 400 slave owners. Throughout the West Indies, people were brought and indeed the ship was stacked with goods including certain tobacco, sucrose but mostly cotton. Then perhaps the boat sailed back to England through its penultimate corner.

Furthermore, the triangular commerce or perhaps the triangle of exports is completed.