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How did the siege of Saguntum trigger the Second Punic War?

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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 siege of Saguntum served as the catalyst for the Second Punic War by forcing a direct confrontation between the expansionist goals of Hannibal and the diplomatic interests of Rome.12

Although a previous treaty had established the Ebro River as the northern limit of Carthaginian influence, Saguntum was located south of the river. Rome had established a relationship of friendship or alliance with the city, leading them to view any attack on it as an act of war. In 219 BCE, Hannibal—seeking to provoke a conflict to challenge Roman power—laid siege to the city.312

Following an eight-month siege and the fall of Saguntum, Rome demanded the surrender of Hannibal. When the Carthaginian government refused to disavow his actions and instead upheld his policy, the diplomatic impasse resulted in a formal declaration of war by Rome. This event effectively ended the period of uneasy peace and initiated the second major struggle between the two powers.123