How did Michelle Obama contribute to the US?

Answer 1

As the first African American first lady who is out in public ( as opposed to sally fields, mistress to President William Jefferson and mother to many of his children but also his slave), Michelle Obama has made a lot of little girls who think they can never be first lady because of their skin color, able to believe they can be first lady, or even president.
She has also shown that black women look nice and can be lawyers and not only entertainers. She is a good role model to black women and a demystifier for the whole US in general.
She has helped a lot of war veterans families and shown that its not boorish to have a garden in your backyard and eat healthy. She is tall and has shown that tall ladies do not have to wear boring clothes or wear overly revealing clothes to look good. she has also shown that first ladies do not have to look stuffy but can be bright and breezy and beautiful.
She encourages youth still in school and is a general sunshine in the White House. and in America

Answer 2

She ruined school lunches and banned king-sized candy bars.