John Florio and Ouisie Shapiro are the authors of 'One Nation Under Baseball: How the 1960s Collided with the National Pastime,' and 'One Punch from the Promised Land: Leon Spinks, Michael Spinks, and the Myth of the Heavyweight Title.' Their young adult book, 'War in the Ring: Joe Louis, Max Schmeling, and the Fight Between America and Hitler,' is due out in 2019.