Umm Washington DC I’m pretty sure I’m just a 5th grader with late homework
There have been 4 Quadruple
Britian had abundant sources of coal
Britian had a strong workforce
Britian had good transportation networks
Since i can’t see the timeline i’m just gonna assume that it’s referring to Pax Romana, since the rest of those things were not as long as Pax Romana
Answer:
Google:
The West Africans exchanged their local products like gold, ivory, salt and cloth, for North African goods such as horses, books, swords and chain mail.
Explanation: