Board Thread:Questions and Answers/@comment-2601:8C5:100:1723:B18E:85EF:E12D:3D8-20181022045358/@comment-35173793-20181023220629

Sometimes in the civilization stage, other cities can become hostile should your terrority increase. [Hence, "every other city gone at war with me"].

You were victorious whenever the other cities attacked, so eventually you beat the stage.

At least, that's whag I've gathered. I hope this was helpful. :)