During the gold rush, the Yukon Rivers largest settlement was Dawson.

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During the gold rush, the Yukon River’s largest settlement was Dawson.
During the gold rush, the Yukon Rivers’ largest settlement was Dawson.
During the gold rush, the Yukon’ Rivers largest settlement was Dawson.
During the gold rush’, the Yukon Rivers largest settlement was Dawson.

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I don't know but it seems like all the answers are the same