After Denmark Vesey's revolt, South Carolina was willing to place limits on the liberties of free Black people in order to protect the institution of slavery. Which action proved this point?
a. nullification of the 1828 tariff
b. publication of Maria Stewart's article in The Liberator
c. founding of the Massachusetts General Colored Association by David Walker
d. election of Andrew Jackson as president
e. passage of the Negro Seaman Acts