Which state would have been the most likely to oppose the admission of California into the Union?

Question

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South Carolina would have been the most likely to oppose the admission of California into the Union due to its pro-slavery stance, as California's constitution prohibited slavery. Massachusetts and Pennsylvania were both free states and would have likely supported the admission of another free state. New York, though a divided state on the issue of slavery, would not have opposed California's admission as it was in the process of abolishing slavery itself.

Which State Would Have Been the Most Likely to Oppose