Conversation so far:
What are some awards Jim Thorpe won in football?
Jim Thorpe joined the Canton Bulldogs American football team in 1915, helping them win three professional championships
What other honors did Jim Thorpe receive from his football career?
The Pro Football Hall of Fame inducted Jim Thorpe as part of its inaugural class in 1963.
Did Jim Thorpe receive honors outside of sports?
President Richard Nixon, as authorized by U.S. Senate Joint Resolution 73, proclaimed Monday, April 16, 1973, as Jim Thorpe Day to promote the nationwide recognition of Thorpe.
What are some other notable honors that Jim Thorpe received besides 3 AFL championships, Pro Football Hall of Fame inaugural class, and April 16, 1973 proclaimed Jim Thorpe Day?
In 1999, the Associated Press placed him third on its list of the top athletes of the century, following Babe Ruth and Michael Jordan. ESPN ranked Jim Thorpe seventh.

Question: What is the biggest honor that he received?
Self-contained rewrite: What is the biggest honor that Jim Thorpe received?