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Why did the Roman victory at the Metaurus River change the course of the war in Italy?

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Historical map of the western Mediterranean region during the Punic Wars, showing Carthaginian territory in orange and Roman territory in green around 270 BCE. Hannibal's route from Spain, across the Alps, and into Italy between 219 and 202 BCE is marked with a red line. Key battle sites with years are labeled throughout Spain, Italy, Sicily, and North Africa. — Punic Wars The Punic wars led to the destruction of Carthage.

The Roman victory at the Metaurus River in 207 BCE was a decisive turning point in the Second Punic War because it prevented the unification of the Carthaginian forces in Italy.123

By 207 BCE, Hannibal had been operating in southern Italy for years, but he remained unable to secure a decisive victory or break the loyalty of Rome's core allies. His brother, Hasdrubal, marched from Spain across the Alps with a large army, intending to join Hannibal in central Italy for a direct assault on Rome.12

The Roman consul Gaius Claudius Nero executed a brilliant tactical maneuver by secretly moving his troops north to join his colleague, Marcus Livius Salinator. Together, they intercepted and destroyed Hasdrubal’s army at the Metaurus. This victory effectively ended the threat of a coordinated Carthaginian offensive on the capital. With Hasdrubal dead and his army annihilated, Hannibal was isolated in the south, eventually leading to his recall to Africa in 203 BCE and the conclusion of the war in Italy.124