This cartoon has not appeared unedited on American television for decades. The edited sequence shows Bugs Bunny trying to cross the Mason-Dixon line in black-face (brownface?). He sings two songs (the second of which, "Yankee Doodle", enrages Confederate Sam) then, placing a whip in the bewildered Sam's hand, Bugs acts as if Sam is going to beat him. Bugs then exits and re-enters as an indignant Abe Lincoln.
Southern Fried Rabbit
Bugs heads toward the record carrot crop in Alabama but runs into Colonel (Yosemite) Sam who is under orders to let no Yankee cross the Mason-Dixon line.