A recent study analyzing over 4 million Roman coins found in 24,646 archaeological deposits has offered a new perspective on how Rome expanded its influence. Researchers from the Regional and Urban Economics Laboratory at the University of São Paulo (NEREUS-USP) used these coins to reconstruct the monetary circulation of the Roman Republic between 155 BCE and 2 CE. Their findings challenge traditional views that emphasize military conquest as the main driver of Roman expansion, suggesting instead that economic integration of newly conquered regions played a more crucial role in consolidating Roman power. The study used advanced data science techniques combined with archaeological evidence. Researchers accessed the Coin Hoards of the Roman Republic Online (CHRR) database and digital platforms such as ORBIS, Pleiades, and databases on Roman roads. These tools helped map how coins moved across the empire and how they were used in different regions. The researchers argue that while military forces initiated expansion, it was local markets, temples, and administrative systems that sustained long-term integration of new territories into the Roman economy. The data revealed that Rome’s territory was organized into three distinct economic zones. At the center was Rome itself and the highly integrated Italian peninsula, which formed the administrative core. Surrounding this was an intermediate belt, a transitional area where administrative, economic, and military activities coexisted. The outermost region was a military periphery, where spending on conquest and territorial control was dominant. The study found that while military campaigns introduced coins into new regions, these coins only became a lasting part of the local economy once integrated into existing structures. Temples, markets, and local governments created a continuous demand for money, ensuring its circulation. Without such institutions, coins introduced by the Roman army often disappeared, either being hoarded or failing to stimulate local economic activity. The distribution of coins also followed patterns dictated by administrative centers, military zones, and commercial hubs, with coin density aligning with Roman transport networks and urban infrastructure. Published in June 2026 in the journal Humanities and Social Sciences Communications from the Nature group, the study raises questions about whether similar integration mechanisms were at work during the late Roman Empire. As the empire’s borders stabilized and faced invasions, the carefully built economic and civic networks may have been disrupted, altering the way Rome managed its vast territories.