9:11 anniversary Timeline of historic terror attacks 20 years ago | USA TODAY
Witness the moments when America was struck with the most horrific attacks in the nation’s history one Tuesday morning.
The sense among Americans that the Sept. 11 attacks permanently changed life in the USA has grown over time, not faded – even as the 20th anniversary of 9/11 approaches and a new peril threatens the nation.
The Sept. 11 attacks provided the impetus for U.S. invasions of Afghanistan and Iraq. It led to the creation of the sprawling Department of Homeland Security and a new federal agency to enforce much tougher screening at airports.
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