Which of the following was the fast growing social class in antebellum america?
a. the upper class
b. the middle class
c. the working class
d. the poor

I think the correct answer from the choices listed above is option B. The fast growing social class in antebellum america is the middle class. The middle class was the class that wasn't exactly rich, but definitely not poor. This class was "created" during the Antebellum period.