Factual error: Ben, Abigail and Riley arrive at the Library of Congress to take the President's Book very late at night. However the Library of Congress, despite being shown as open, consistently closes at 5 PM.

National Treasure: Book of Secrets (2007)
Ending / spoiler
Directed by: Jon Turteltaub
Starring: Nicolas Cage, Ed Harris, Helen Mirren, Harvey Keitel, Jon Voight, Diane Kruger, Justin Bartha
Ben (Nicolas Cage), Abigail (Diane Kruger), Ben's parents (Helen Mirren and Jon Voight), Riley (Justin Bartha) and Mitch Wilkinson (Ed Harris) enter Cibola, the City of Gold (located near Mount Rushmore). On the way out, surrounded by flooding water, Mitch keeps the door open so that Ben can get out and dies; he asks Ben that he receive credit for finding the city (he wanted his name to be a part of history). The president congratulates the team on finding the city. Ben's ancestor's name is cleared of being called a traitor. Ben and Abigail get back together; Ben's parents get back together; a research team enters the City of Gold and starts studying the place. Riley gets his Ferrari back and tax free.
Trivia: The easter egg roll scene was filmed on Mount Vernon, with the White House added in the background.
Question: How does finding the treasure clear Thomas Gates of plotting Lincoln's death?
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Chosen answer: Because it verifies the story that the Gates family has passed down, that the pages were burned to protect the city of gold's location, not to hide his name as a plotter.
Boobra