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The official record shows that the United States had spent years preparing for terrorism, expanding investigative authority, monitoring al Qaeda, tracking suspected operatives, gathering intelligence, and debating how agencies could share information. September 11 did not expose a threat that Washington had never considered. It exposed how badly a government that already understood the danger…

Source: THE FILES THEY ALREADY HAD: WHAT DECLASSIFIED CIA RECORDS REVEAL ABOUT THE FAILURES BEFORE 9/11 – The Realist Juggernaut