Abraham Lincoln loved telling jokes. He believed that a humorous story was often the best way of teaching something. This was a favorite joke he was known to have told his sons…

“How many legs would a dog have if you called its tail a leg?”
“Five!” his sons would answer.
“No, it would have only four,” Lincoln would reply. “Calling a tail a leg does not make it a leg.”

Apparently Lincoln did not understand how gender works… or race.