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How did the Visigoths contribute to the fall of Rome?

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The Visigoths played a pivotal role in the decline of the Western Roman Empire by exposing its military vulnerabilities and challenging its political authority. Their contribution to the fall of Rome is marked by several key events:

Battle of Adrianople (378): After being mistreated by Roman officials following their authorized settlement in the empire, the Visigoths revolted. Their decisive victory at Adrianople, where they destroyed a Roman army and killed Emperor Valens, revealed the empire's inability to contain Germanic tribes and marked the beginning of significant incursions into Roman territory.12
Sack of Rome (410): Under the leadership of Alaric, the Visigoths besieged Rome three times after the empire failed to provide promised land, supplies, and subsidies. The eventual sack of the city in 410—the first time Rome had been captured by a foreign enemy in nearly 800 years—sent shock waves throughout the empire and served as a powerful symbol of Rome's waning dominance.341
Erosion of Imperial Control: The Visigoths' persistent military pressure forced the empire to divert resources and eventually led to the loss of control over provinces in Gaul and Spain, where the Visigoths later established their own independent kingdom.1