How did the collapse of the Roman Empire contribute to the development of regional Romance languages?

The development of regional Romance languages from Vulgar Latin was significantly influenced by the administrative and social fragmentation that followed the collapse of the Roman Empire.12

While the empire maintained a standard written language that provided a degree of uniformity, the loss of centralized administrative control allowed regional linguistic variations—which had long existed as phonetic and lexical differences—to diverge further. The emergence of feudalism played a critical role in this process by splitting the previously open society of the Roman tradition into small, closed territorial units, which hindered communication and fostered local linguistic evolution.31

Some scholars suggest that the influx of barbarian groups during the 5th century further disrupted communication, accelerating the divergence of these regional speech patterns. By the 8th or 9th century, speakers in areas like France, Spain, and Italy began to perceive their vernacular speech as distinct from Classical Latin, eventually leading to the development of conventional written forms for the emerging Romance languages.13