I think the “tipping point” so to speak was much closer though. There was the Fugitive Slave Act of 1850, which took away Northern states’ right to not be complicit in slavery. Then in 1861, Kansas entered the Union as a free state and the slavers were now out-voted in both the EC and Senate. Shortly after Kansas became a state, they attacked the US.
I think the “tipping point” so to speak was much closer though. There was the Fugitive Slave Act of 1850, which took away Northern states’ right to not be complicit in slavery. Then in 1861, Kansas entered the Union as a free state and the slavers were now out-voted in both the EC and Senate. Shortly after Kansas became a state, they attacked the US.