Why did the chicken...? etymology

What is the history of the “Why did the chicken cross the road? To get to the other side” joke? Who first said or wrote it?

Actually, the original answer was, “To show the 'possum that it could be done.” However, the Oppossum Antidefamatory League objected to that answer, so they made it the innocuous answer.

From Why did the Chicken cross the road?

Who said JC and the Boys didn’t have a sense of humor ?