I can’t seem to locate it, but in one of his speeches Lincoln talks about how slavery had been made more harsh in recent years. To be fair this was largely because southerners felt their institution was under attack and natural human tendency is to crack down in defense.
That it was becoming more profitable is easily seen by prices, which reached their all-time high in 1860. Even slaveowners don’t bid up the price of a capital asset unless they think its future prospects for income are also increasing.
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To be fair??? To whom??? The Southerners holding the whip (what do you think crack down means)?
North Carolina permitted free men of African slavery to vote until 1835. Slavery in the southern states was indeed getting more harsh. Not being a slave was getting more harsh too.