Jean Schulz, wife of cartoonist Charles Schulz, shows the Social Commentary exhibition at Charles M. Schulz museum in Santa Rosa, Calif., on Monday, September 22, 2014. Schulz introduced Franklin, a black Peanuts character, into the predominately white c

Jean Schulz, wife of cartoonist Charles Schulz, shows the Social Commentary exhibition at Charles M. Schulz museum in Santa Rosa, Calif., on Monday, September 22, 2014. Schulz introduced Franklin, a black Peanuts character, into the predominately white cast July 31, 1968, just months after Rev. Dr. Martin Luther King, Jr. was assassinated. (Photo By Liz Hafalia/The San Francisco Chronicle via Getty Images)