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When did Wonder Woman join the Justice League of America?
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Wonder Woman
Lynda Carter as Wonder Woman.
Wonder Woman appeared as a founding member of the Justice League of America in The Brave and the Bold no. 28, which was published in February–March 1960.1
While she was a featured member of the Justice Society of America in earlier years, her role as a founder of the Justice League marked a significant expansion of her presence in the DC universe.213