Walking through the new George W. Bush Presidential Center at Southern Methodist University, Laura Bush looked back on the pivotal moments in her husband's presidency.
The terrorist attacks of Sept. 11, 2001 topped the list.
The former first lady spoke with ABC News' Diane Sawyer at the new library, set to open on Thursday. As the news media and the nation take a moment to revisit George W. Bush's tenure in the White House, so did his wife.
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