Final answer:
After Aristotle Onassis's death, Jackie Kennedy returned to New York and became a successful book editor. She did not start a charity, go into hiding, marry again, or write a memoir. Her work as a book editor and her efforts as First Lady are part of her lasting impact on American history.
Step-by-step explanation:
Following the death of her husband, President John F. Kennedy, Jacqueline Kennedy married Greek shipping magnate Aristotle Onassis in 1968. This move was often seen as an effort by Jackie to protect her children from the intense public scrutiny and potential dangers associated with being a part of the Kennedy family. After Onassis's passing in 1975, Jackie Kennedy did not start a charity, go into hiding, marry again, or write a memoir. Instead, she returned to New York and pursued a successful career as a book editor.
Jacqueline Kennedy's role as First Lady was marked by her significant efforts to refurbish the White House along historical lines, which gained public attention. Lady Bird Johnson succeeded her and continued to impact the role of the First Lady by endorsing public space beautification and establishing the foundations of the modern Office of the First Lady. However, these efforts did not include the activities listed in the question. Jackie Kennedy's life in the public eye, combined with her later work in publishing, continues to be a subject of interest for those studying American history and the legacy of the Kennedy family.