While 9/11 was understood at the time as a world-changing event in international relations, the uneven long-term effects for North America could not have been predicted. Twenty years later, The Legacy of 9/11 explores the political, economic, trade and border and security and defence, implications.
Wide-ranging changes have been made to the North American Aerospace Defense Command (NORAD) since 2006, when the binational agreement was signed in perpetuity. NORAD traces the joint command's recent history - one marked by technological and structural innovations, but also by unprecedented threats and challenges.
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