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It seems to be no understatement to conclude that the terrorist attacks of September 11, 2011, permanently reconfigured the way so many of us in the United States see the world, and ourselves. Two decades later, there are a number of lessons that stand out to me, especially for leaders and organizations.

Further upstream from structures, systems, and processes lies organizational culture. And when it comes to building and leading teams, nothing is more powerful than culture. There are a lot of dynamics that can corrode the health of an organization, but here are two especially dangerous threats to any team.