The Pandaren Empire is the nation-state of the pandaren in their homeland of Pandaria.
Hailing from the secretive Pandaren Empire, the mighty brewmasters travel the world in search of exotic ales and the finest brewed spirits.
It does not include lands west of the Serpent's Spine. Only the Shado-Pan and highly adventurous expeditions venture there.
After Azeroth's destruction, the Pandaren Empire were forced to leave it's homelands and traveled with the rest of the millions of other Azerothians who escape the planet's destruction and settled on New Azeroth, the newly created colony for refugees from Azeroth
It was absorbed into the Alliance of New Azeroth in 2379 N.E.