The answer is:
Suffrage items with historical importance were once rejected by the Smithsonian, but later accepted after women were given voting rights.
In the excerpt from Suffragists' "Great Demand" Banner, the author deals with the Smithsonian's museum first refusal to acquire a donation of a Susan B. Anthony's portrait by Sarah J. Eddy. Nevertheless, the contribution and other items which belonged to Anthony were welcome once women were allowed to vote.