Well, that answers that question. But when maps of Equestria are shown, Equestria looks nothing like North and South America. That means that Earth’s continents must’ve moved super rapidly, in only a few thousand years, to form Equestria as we know it now. Or ponies must’ve travelled to some other planet in space. And also, to support your theory, in the episode when Big Mac falls in love with Cheerliee, in one scene, both of them get stuck in a hole, we see a cross section of the ground, and in one of the layers, we see a car tyre sitting there buried in the ground. That means there must’ve been an earlier civilization which had cars that disappeared long ago for that tyre to be buried that deep.