Answer:
Millard Fillmore, Franklin Pierce, and James Buchanan, are the right options.
Explanation:
The American Civil War began in the United States between the Union and the Confederacy. This war started originally as an outcome of the long-standing conflict over the slavery of the black community. The war occurred in April 1861 with the invasion of Fort Sumter by the secessionist troops, shortly after the inauguration of Abraham Lincoln as the President of the United States. Nonetheless, the three weak presidents Millard Fillmore, Franklin Pierce, and James Buchanan had much to do with causing the Civil War between 1848–60.
