The point is that if institutional slavery exists even to today, what would make you sure that the States chose to end slavery without the 13th amendment?
Simple, the US wasn't some 3rd world country by 1860. IIRC, there were only 11 Confederate slave states remaining during the Civil War as most of the country was slave-free. There were still some Union slave-states. In the US, the trend was anti-slavery since the Revolutionary War, not pro-slavery so it's just a logical assumption that the remaining states of the SE US would eventually become slave-free without federal intervention.
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