Explain why by 1859 the concept of popular sovereignty was no longer a

Explain why by 1859 the concept of popular sovereignty was no longer a feasible alternative solution to the problem of slavery in the territories.

What will be an ideal response?

ANSWER
Popular sovereignty had been tried in the Kansas Territory and had been found wanting as a peaceful way to solve the question of slavery in the territories. It had instead led to violent personal conflict, a local civil war, and a corruption of democratic procedures.