To effectively match the causes with the effect of "increased economic and military power," we can look at the various responses:
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A: a standing army of many trained soldiers - This directly relates to increased military power.
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B: the formation of alliances with other city states - This can contribute to economic and military power by providing mutual support and resources.
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C: a series of highly strategic army leaders - While this can enhance military strategy, it may not be as direct a cause of overall power compared to others.
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D: the development of bronze to make weapons - This is a technological advancement that would significantly enhance military capabilities, thus contributing to increased military power.
For the response area, suitable combinations could be:
Cause:
- A: a standing army of many trained soldiers
- D: the development of bronze to make weapons
Effect:
- Increased economic and military power
You can choose A and D to represent the causes contributing to the effect of increased economic and military power.