Comment on Pinkie Pie by johnjoseco
And that is how Equastria was made...
Now the only thing to figure out is how Celestia and Luna came to be.
They were born from different attributes of parties: the main parties(Celestia) and the after party(Luna), Yup their mom is Pinkie Pie! 
Then who's the father then?
Its a mystery!
The best mystery ever!