The Allied Races: Kul Tiran is unlocked after completing the following achievements: A Nation United; Tides of Vengeance; and reach Exalted with Proudmoore Admiralty.
Once these are completed, go to the Stormwind Embassy (52.14 13.36) to talk to Jaina Proudmoore who provides the starting quest: Made in Kul Tiras.
Watch the entire Allied Races: Kul Tiran Questline videos as a playlist.
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