They usually traded these for slaves which were captured and sold to them.
Answer:
They could pay their debts using a government banking system.
Explanation:
All three of these factors--overpopulation and overuse of the land, endemic warfare, and drought
Britain would be the best as it is an island and its strong navy made it hard for invasion
Alfred Thayer Mahan was an American Naval officer in the latter half of the 19th-Century that is generally regarded as the father of the modern Navy, especially in the Unites States but also around the world. His writing would become required reading for anyone interested in the Navy or naval issues and is still regarded as a prescient thinker on international relations.
