Longest survival of Slavery without Secession?

I'm not sure how to avoid Secession. I think probably there has to be at a minimum no Fugitive Slave Act and no Bleeding Kansas. So the Wilmot Proviso somehow gets passed, either in its strong version, or the proposed amendment of extending the Missouri Compromise line westward, Or something with similar effect (Zachary Taylor lives?)

Either way, clear limits on the further expansion of slavery into new territories, coupled with a willingness to let it continue in its present state until it dies a natural death.

In those circumstances, how long can the peculiar practice continue?
 
One of the issues behind the southern angst was the reality that the House of Representatives had tilted to the Northern "free" or border states where slavery was either outlawed or fading away rapidly. Immigration and the new states being admitted, where even if they had been allowed to go slave initially the land etc was not suitable for plantation farming, and therefore the pro-slave population would be voted down eventually. This reality meant that "slave" representatives would become a smaller and smaller minority, even with the 2/3 rule for counting slaves, and the slight edge the "free" states had in the Senate would also expand.

While slavery was eliminated by a constitutional amendment, it would be easier to pass legislation which requires only a majority to pass and no approval by state legislatures. IMHO by the 1870s at the latest the combination of a significant diminution of "slave power" in the Congress, and the decreasing economic viability of slavery would end it.
 
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