You know, the book with the

TIME TRAVELING TALKING HORSE.

And it turns out not only can he time travel and talk, he can also turn invisible by holding his breath.

According to the book, Liberty was actually Paul Revere's horse, and was struck by lightning and was granted his current abilities. As Rush Revere finds out, though, he can't travel to the future... but only because he doesn't know the magic words to do so. He only knows the magic words for traveling to various points in the past.

Therefore, fanfic fuel. How did a bolt of lightning grant Liberty his abilities? Did Twilight try to cast a spell that could grant magic to another dimension, and the spell struck Liberty? What if Liberty learns the magic words to ride to America's future... and learns that Rush's beloved nation has fallen not to socialists or liberals, but to Changelings?

The possibilities here are crazy-endless!

2064177 Liberty is the result of an AU S2E20 "It's About Time" Twilight.
She instead uses an Alternate Universe spell, and gets hurled into the Rushverse, where she is turned into a stallion and receives new magical powers in exchange for her superior unicornity.

2064775

...that baffles me.

2065521 Lemme explain:
Alternate Universes solve everything.