My Little Pony XCIX: Leakier Than A Changeling Bathtub!

[Rater202]

We've seen ponies conquer non-ponies' lands, at least twice. Once in the present of the show, in Bridle Gossip.

Explain.

that the myth of the kingdom's fall is just that, a myth. Probably started by the conquerors.

Don't we see that the idle exists? Regardless, "this myth is just a myth" is never a fair assumptions to make in a setting where every other established myth turns out to be true and the setting in general is one with magic and legendary creatures as a matter of every day life.

The yaks we're pushed to a marginal territory even when the Crystal Empire was gone.

Cite where the Ponies forced the Yaks to live in Yakyakistan.

but that was probably in the expectation that the ponies would not provide. A justified expectation.

Your excessively pessimistic fanon is showing.