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

Millard Fillmore, James Buchanan and Franklin pierce were considered as worst presidents of America during the period of 1850 to 1860.

Explanation:

Fillmore is the thirteen American president. Fillmore’s actions had turn into a national crises and delay in the outbreak of the civil war, though it brought peace that was unfair. After two decades New York Times declared that misfortune to see in slavery a political and not a moral question. This made Fillmore a worst American president.

Franklin pierce is 14th American president. Pierce preferred to conquer Cuba but his enemies distrust addition of new slave state, his enemies came to know the plan before, therefore rejected conquering Cuba. This made Pierce a worst American president.

James Buchanan 15th American president. James presidency was perforated with many troubles the he was unable to reduce. The decision by James in 1870 was to include small farmers would distress the political balance of slave states and free states. This made James a worst American president.

i think it's the cabinet