How 9/11 continues to shape America

25 years ago, tragedy struck the United States. Nearly 3,000 lives were lost, history was forever changed, and the America we know now continues to be shaped by the actions of government leaders following this attack. Jeffery Engle, the David Gergen Director of the Center for Presidential History at Southern Methodist University, joined us to discuss where the United States is at, 25 years after the Sept. 11 attacks.