History is who we are and why we are the way we are.

McCullough’s line frames history not as a remote record of dates and leaders but as a living explanation of identity. “Who we are” suggests that collective character—institutions, values, habits, and assumptions—is inherited from prior choices and experiences. “Why we are the way we are” adds a causal claim: present conditions and attitudes become intelligible when traced to their origins. The quote also implies a civic purpose for historical study: understanding the past is a form of self-knowledge that can correct amnesia, challenge myths, and make public debate more grounded. In McCullough’s spirit, history becomes both narrative and diagnosis.