1. Jack Johnson. The first Black Champ and the fact that he married white women when that sort of thing just wasn't done, but, man, he did it!! His fight with Jeffries was the Ali-Frazier I of the time. The whole country took interest and the outcome caused race riots.
2. Joe Louis. The whole country rallied behind him for the second Schmelling fight and he still remains a beloved figure.
3. Muhammad Ali. The draft. The name change. The Frazier fights. What more needs to be said.
After listing the heavies that you think make the list feel free to name those of the lighter weights as well.