Question

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

Millard Fillmore
Franklin Pierce
James Polk
Zachary Taylor
John Tyler
James Buchanan

Answer 1

disclaimer: this is not my solution so I cannot testify to its accuracy

but a quick internet search tells me Filmore, Pierce, and Buchanan across several sources.

from what I can understand here are some of their major offenses:

Filmore: signed the Fugitive Slave Act and whose weak leadership contributed to the start of the Civil War

Pierce: supported the Kansas-Nebraska Act which gave some states the right to choose their stance on slavery and created chaos in the Kansas-Nebraska region

James Buchanan: was pro-slavery and was president during the Dred Scott Decision (which denied citizenship to black people)

https://www.washingtonpost.com/news/retropolis/wp/2018/02/20/the-10-worst-presidents-besides-trump-who-do-scholars-scorn-the-most/?noredirect=on&utm_term=.c0d670ff069c

Answer 2

thanks