For centuries, Equestria has been lead by an omnipotent regent that knew right from wrong, guilty from innocent, brave from cowardly, truth from lie...
But there was an earth pony settlement, founded only a hundred years ago, which didn't fully accustom to this form of state. They elected a mayor to act in their name, over their own, though bowing to the higher ladies.
With a princess of their own, there no longer was a need to hold elections, choose one of them to represent them, rule them self to a distinctive degree. Democracy had been abandoned.
All this, Twilight Sparkle has put thought into, and she has proposed a letter to the princess, informing her of her plans. Princess Celestia's reaction might be a lot different to Twilight's suggestion than the newly crowned Princess of Friendship had thought.
There is a reason why Celestia is still in charge after so long, and she will explain to Twilight why that is.
Proofread by Cubidyow