The factor that most contributed to the growing economies of Mesopotamian Empires among the options provided is improvements to roads.
Developing and improving transportation infrastructure, such as roads and waterways, facilitated trade, communication, and the movement of goods and people. This helped to enhance economic exchange both within the empire and with neighboring regions, leading to economic growth. While new codes of law and religious beliefs played important roles in the structure and cohesion of society, improvements in transportation were crucial for economic expansion.
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