Joining a union is automatic once you reach a certain level.
You can, however, also join a union manually. First, find the button in the upper left-hand corner of the screen with the text message icon. After pushing it, you will see the chat window of your future union. Press the Join Now button, and you’ll be automatically assigned to one of the alliances of island managers.
If you don’t play online for an extended period of time, you’ll be automatically transferred to another union.
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