To answer the question regarding the contributions to the increased economic and military power of the Sumerians, we can categorize the responses in the following way:
Cause:
- a standing army of many trained soldiers
- the formation of alliances with other city-states
- a series of highly strategic army leaders
- the development of bronze to make weapons
Effect:
- increased economic and military power
To complete the task, we can match each cause to the effect:
- a standing army of many trained soldiers → increased economic and military power
- the formation of alliances with other city-states → increased economic and military power
- a series of highly strategic army leaders → increased economic and military power
- the development of bronze to make weapons → increased economic and military power
In summary, all listed causes contributed to the increased economic and military power of the Sumerians.