Final answer:
After the fall of the Roman Empire, A. Europe transitioned from a centralized power to a decentralized feudal society, leading to more rural living, less efficient commerce, and political fragmentation.
Step-by-step explanation:
A major change that occurred in Europe after the fall of the Roman Empire was that A. Europe went from being centralized to decentralized. The collapse of Roman authority brought political instability and the decline of urban life, shifting power to Germanic warlords and the Catholic Church.
This fragmentation resulted in a society structured around individual feudal lords and fiefs, creating conditions for what would become the medieval culture different from the Roman legacy that preceded it.
Europe became increasingly rural, with smaller kingdoms in constant warfare and shifting alliances. This era was marked by a decline in centralized power, lessened urbanization, and a less efficient system of commerce due to dangerous travel — circumstances that significantly deviated from the centralized Roman governance.
The post-Roman world saw the rise of feudalism and a shift in socio-political structures.