Some ideas for Friendship is Magic fan fiction

First, in the episode, “Hearth's Warming Eve” we are told that the Equestrian nation is not the first home of the ponies. The ponies moved to what became the Equestrian nation to escape the curse of the windigos. Luna could send a team of well-educated ponies to check up on the original pony homeland and then see who or what is living there now. There might be ancient pony artifacts, a hidden Unicorn treasure vault, or the workshop of Star Swirl the Bearded that needs to be found again.

Spike: [accent] And so, each leader encountered obstacles along the way, but eventually, they all arrived in a new and wondrous land. Nopony had ever seen paradise before.

Rainbow Dash: This is the new land we've been searching for!

Fluttershy: What a view... I can see my future house from here.

Rainbow Dash: I proclaim this new land to be... Pegasopolis!

Rarity: I've never seen such jewels! This ruby is dazzling. This whole land is dazzling. I'm double dazzled! [squeals] In the name of the unicorns, I hereby dub this land Unicornia!

Pinkie Pie: The air! The trees! The dirt! This dirt is the dirtiest dirt in the whole dirt world!

Applejack: And fertile, too. Perfect for growing food.

Pinkie Pie: In the name of the Earth ponies, I think I'm gonna call this new place... uh... Dirtville!

Applejack: How about "Earth"?

Pinkie Pie: Earth! Congratulations to me for thinking of it.

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Second, in the same episode the Ruler of the Pegasi, Commander Hurricane had this exchange with Private Pansy.

Fluttershy (Private Pansy): Oh! Commander Hurricane, sir! How did it go, sir?

Rainbow Dash (Commander Hurricane): “Horribly! Those other tribe leaders are so disrespectful! Don't they realize that we are a mighty tribe of warriors, and should not be crossed? We have got to break ranks with those weak foals!”

Pegasi are a mighty tribe of warriors that means that they must have fought with other tribes and nations to be warriors. You can’t be a tribe of warriors if there is no one to fight. Are they living Pegasi who want to recreate Commander Hurricane’s dream of building Pegasopolis.

Moreover, what about the tribes and nations that the ancient Pegasi fought? Imagine some of those descendants with whom the ancient Pegasi fought might come looking for revenge.