Which three presidents (1850–1860) are considered to be among the worst in american history?

a.) millard fillmore
b.) franklin pierce
c.) james polk
d.) zachary taylor
e.) john tyler
f.) james buchanan

The answers to the question above are letter "A. Millard Fillmore", "B. Franklin Pierce", and "F. James Buchanan". Pierce was unable to handle the repudiation in Kansas who denied him party's nomination. Fillmore, on the other hand, allowed the spread of slavery. Buchanan liked to brag about his contributions. 

Fillmore, Buchanan, and Pierce