<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Who would you say is the worst president of all-time?
<|assistant|>
It is hard to determine who the "worst president of all-time" is, as it is dependent on one's own opinion and political viewpoints. Some people may rate certain presidents as the worst based on certain issues, while other people may rate other presidents as the worst for different reasons. A popular choice among historians for the worst president of all time is James Buchanan, who was the 15th president of the United States, serving from 1857 to 1861. Buchanan is known for his inaction amid the rising tensions that ultimately led to the Civil War. He is also criticized for supporting the Dred Scott decision, which ruled that the federal government had no power to restrict slavery in the territories.