Robert Crumb's Short History of America. This is a 12-panel gif. Give it a second to flip through, or reload the page to see if from the beginning.

For those who are not familiar, R. Crumb was one of the founders of the American underground comic movement, and is famous for both the "Mr. Natural" cartoon and the cover art for Cheap Thrills by Big Brother and the Holding Company with Janis Joplin.

Not to be confused with Gilbert Shelton who did the Fabulous Furry Freak Brothers.
.