To mark Fault Lines’ 500th episode, Martha, Jamil, Les, Morgan, and Jess reflect on how September 11, 2001 reshaped U.S. national security—and what comes next. From the trauma of that day to more recent shocks like political violence at home, the team examines how terrorism has evolved but remains a persistent threat, both domestically and abroad. They share personal experiences from 9/11 and the years that followed, the unity it inspired, and the lessons Americans cannot afford to forget.

But if terrorism once defined an era, what will define the next? Will it be great power competition, a resurgent Russia, technology-driven threats, or growing disunity at home? How can the U.S. strike the balance between strength and restraint, maintain deterrence without complacency, and rebuild trust in American leadership at home and abroad?

@morganlroach

@marthamillerdc

@NotTVJessJones

@jamil_n_jaffer

@lestermunson

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