No one is quite sure why "A New Generation" turned out the way it did, though evidence points to Applejack and her... less than charitable views on certain topics.
Set after the end of Season 9. The timeskip is non-canonical in this story.
Cover image is an edited version of the A New Generation poster with a vector Applejack found on the internet. If you know the original source of the Applejack image, please post it in the comments and I'll update the description.