Doonesbury by Garry Trudeau for January 19, 1971
Calvin: Say, B.D., where are you from? B.D.: Well, Calvin, I was born and raised in the heartlands of America...I have fond memories of my home...I still remember waking up at dawn and looking out to see blue skies, and negroes toiling under the sun....oops, er...ah...at $3.25 an hour!!