Answer:
The three president that are considered to be among the worst in American history are:
-Millard Fillmore (1850-1853)
-Franklin Pierce (1853-1857)
-James Buchanan (1857-1861)
Explanation:
-Millard Fillmore was the thirteenth president of the United States. He ended the term of his predecessor Zachary Taylor, who died of natural causes after just over a year in power. Therefore, Fillmore was president, but he never won an election. He was a member of the Anti-Masonic Party and the Whig Party, of which he would be its last president in the White House. Most specialized historians at this time are often considered him as one of the least memorable presidents in the history of the United States, even one of the most mediocre.
-Franklin Pierce was the 14th president of the United States from 1853 to 1857. He became president in an apparently calm time. The United States seemed to have resisted the threat of a split, thanks to the Compromise of 1850. By following the recommendations of southern advisers, Pierce, from New England, hoped to avoid a new threat of separation. But his strategy, which could not keep calm, accelerated the breakup of the union.
-James Buchanan was the 15th President of the United States from 1857 to 1861. He settled disputes with England over Oregon and tried to buy Cuba from Spain. He has been criticized for lack of positive action to prevent the country from slipping away into a downward spiral that ultimately resulted in the Civil War.