Answer:
military expansion
Explanation:
Military expansion is factor which contributed most to the growing economies of Mesopotamian Empires.
Military expansion helped the Mesopotamian empire that defended the city and completed the land or water resources. Military expansion ruled other cities and fulfill all the required resources of the Mesopotamian empire.
Hence, the correct option is "military expansion".
Answer:
improvements to roads
Explanation:
Constructed roads to expand travel and trade
