Which U.S. President received the largest approval ratings increase due to the "rally around the flag" effect?

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George W. Bush received a significant increase in approval ratings after the 9/11 attacks in 2001, which is considered a classic example of the "rally around the flag" effect. His approval rating jumped from 51% to 90% in the aftermath of the attacks, marking one of the largest increases in presidential history due to this phenomenon.

Which US President Received the Largest Approval Ratings Increase Due to to the "Rally