Why does Pericles need to defend the athenian systems?

Pericles needs to defend the Athenian systems to uphold the values and principles of democracy, which are central to Athenian identity and governance. By articulating the merits of their political structure, he aims to inspire confidence among citizens and solidify their commitment to democratic ideals. Additionally, defending these systems serves to counteract criticisms from rival city-states and reinforces Athens' position as a leader in the Greek world. Ultimately, his defense seeks to unify the populace and foster resilience in the face of external threats.