Answer:
That would be an ecosystem
To see how you succeed in a event ot research project yourself
Answer:
Both domestic and external factors contributed to sub-Saharan Africa's poor overall economic performance in the 1980s and early 1990s. Key constraints to growth included inappropriate economic policies, inadequate human capital development, and low levels of private investment.
It was before the era of railways hence waterways were critical factor. They determined the population centers access to trade. Examples rivers (New Orleans, Cincinnati), Great Lakes (Chicago, Detroit), canals (Milwaukee) and obviously sea port cities (New York)