The correct answer to this open question is the following.
Although there are no options attached we can say the following.
I think Jim Braddock's winning streak inspired people so much because he is a good example of endurance, perseveration, and faith when difficult moments make people surrender. In his case, he never surrendered and worked hard to sustain his family during the difficult years of the Great Depression.
Those years of the Great Depression were tough ones. After the US stock market crash of October 219, 1929, millions of Americans lost their jobs, companies broke, and banks went into bankruptcy.
Braddock was a boxer that returned to the ring in 1935, after struggling during those difficult years, and won the championship.
His story is so inspirational even now because is an example of perseveration and endurance under difficult times. It is a history of how a man can overcome adversity if he is committed to doing what he needs to do in order to get what he wants, keeping the faith, and never, ever surrender.