A key technological development that began around 500 B.C.E. in sub-Saharan Africa was ?

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One key technological development that began around 500 B.C.E. in sub-Saharan Africa was iron smelting. To arrive at this answer, we can follow a step-by-step process:

1. Start by understanding the context and timeframe: The question mentions a time period of around 500 B.C.E. and sub-Saharan Africa. This means we need to look for technological developments that occurred during this time and in this region.

2. Review the available information: Consider the technologies that were likely to emerge during this period. For example, the use of iron had already spread to other parts of the world by this time, such as the Near East and Europe.

3. Consider the importance of iron: Iron is a crucial material due to its strength, durability, and versatility. The ability to smelt iron unlocks its potential for various tools and weapons, significantly impacting society and technology.

4. Consult historical sources: Look for archaeological evidence, historical records, and scholarly research that supports the claim of iron smelting in sub-Saharan Africa around 500 B.C.E. Various studies, particularly in regions such as Nigeria, Sudan, and Tanzania, have found evidence of iron smelting during this time.

By following these steps, we arrive at the conclusion that one key technological development that began around 500 B.C.E. in sub-Saharan Africa was iron smelting.