Last competed in 1953 Last competed in 1955 Miss USA , Leona Gage ( MD ) , was announced as a semi-finalist , but was ejected from the pageant the afternoon before the final after it was discovered that she was married and the mother of two young children . Miss Argentina , Mónica Lamas , who had placed 16th in the preliminary , took over the vacated spot . Gage was also stripped of her title and was replaced by Charlotte Sheffield , but Sheffield was unable to compete because the preliminary competition had already taken place , marking the first and , as of 2018 , only time that a Miss USA would not compete at Miss Universe . Sheffield competed at Miss World 1957 , but was unplaced
Miss World 1957
Miss World 1957
Miss Universe 1957