Man from Plains (originally titled He Comes in Peace) is a 2007 American documentary film written and directed by Jonathan Demme, which chronicles former President of the United States Jimmy Carter's book tour across America to publicize his new book, "".

Based on that paragraph can we conclude that this sentence is true?
The United States of America never once had a president who was able to go on a book tour.

Choices:
 + Yes;
 + It's impossible to say;
 + No;