Answer:
No, Buchanan's victory was not a landslide one.
Explanation:
James Buchanan was the 15th President of the United States, elected on November 4, 1856. In that election he defeated John C. Fremont, of the Republican Party, and Millard Fillmore, of the Know Nothing Party.
In the popular vote, he obtained 45.28% of the votes, compared to 33.11% for Fremont and 21.54% for Fillmore. He obtained a greater distance in the electoral vote, but in no way was it a huge difference, but rather a fairly balanced electoral contest between the different participating forces. Therefore, in no way can it be said that his triumph was a landslide victory.