User: When did slavery end in the United States?
Assistant: The abolitionists opposed slavery because it was morally wrong. Slavery was the result of the transatlantic slave trade, which was a major problem in the United States at the time. Slavery was not only an economic burden, but also a moral and ethical burden. Slavery was also a big part of the culture in the southern United States, and many people were very attached to their slaves. The abolitionists wanted to end slavery because they believed it was wrong.