The writer contends that the defining boundary between millennials and Generation Z is whether one retains a personal memory of the September 11, 2001 attacks, describing the event as a "core memory" for themselves but merely history for those under thirty.
They further assert that 9/11 functions as the fulcrum of contemporary geopolitics, noting that virtually every major political development since that Tuesday can be traced back to its impact.
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Illustrating the shift from lived experience to study, the author points to the children’s graphic‑novel series "I Survived," which includes a volume titled "I Survived: The Attacks of September 11," a book their own children enjoy despite not having read the events themselves.