The event from the given quotation which the mayor's comments foreshadow is the Immigration Act of 1924.
This refers to the literary element which gives hints or clues about future events by the use of predictions.
Hence, we can note that from the mayor's comments, he talked about restricting the Japanese because they were dangerous and would drive off all competition in the market and also mentioned the Chinese.
With this in mind, we can note that the Immigration Act of 1924 was one that was later passed that prevented immigration from Asia and set quotas for people coming from Asia.
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