The term 'First Lady of the 1950s' refers to two women: Mamie Eisenhower and Eva Peron. Mamie Eisenhower was the wife of President Dwight D. Eisenhower, who served as the 34th President of the United States from 1953 to 1961. She was known for her sense of style and her love of entertaining. Eva Peron was the second wife of Argentine President Juan Peron, who served as President from 1946 to 1955 and again from 1973 to 1974. She was a powerful political figure in her own right and was known for her advocacy of women's rights and social justice.