Before Deathwing struck, the Goblins lived on Kezan miles away from any interference from the ongoing war between the Horde and the Alliance. They built many contraptions and filled their whole island with them. When Deathwing struck, they were forced to flee and fight sanctuary. The place they came to first was Azshara where they built their new capital city of Bilgewater Harbor. These are not to be confused with the goblins from the Venture Mining Company who hostile to all and the Steemwheedle Cartel who are friendly to all.
Copyright: Blizzard Entertainment