Final answer:
To control their conquered territories, the Romans built infrastructure like roads and cities, assimilated local elites and populace into Roman society and military, and strategically utilized divide and conquer tactics.
Step-by-step explanation:
The Romans employed various strategies to control the territories they conquered. One such method was the establishment of a common infrastructure across Europe, with the construction of roads, bridges, aqueducts, and ports, facilitating both military movement and trade.
Moreover, Romans often suppressed resistance with overwhelming force but also assimilated local elites into the Roman governance system, ensuring administration was partly familiar to the conquered people.
Assimilation was further reinforced by encouraging locals to serve in the Roman army where they could gain wealth and land, thus tying their fortunes to the success of Rome. Finally, the strategic use of the divide and conquer tactic, enabling Romans to avoid coalition warfare by turning enemy factions against one another, ensured that hostile forces were seldom united against them.