The last to hold office before the Civil War, historians say this president divided rather than united. Name that "worst president ever".

Often cited as the worst U.S. president in history, an argument can be made that James Buchanan's policies exacerbated the heat between the North and the South, rather than working to unite them. Seven Southern states seceded from the Union over the course of his single term, launching the U.S. toward Civil War.

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