The timeline of the events identifies the process of extending slavery.
Compromise of 1850 is a package of separate bill that declare Calififornia as Free state leaving Utah and New Mexico to decide whether to be a slave state or a free state
Kansas-Nabraska Act is a legislation passed in US and provides that each territory have the right the decide the issue of slavery on the basis of popular sovereignty.
Dred Scott V Sandford is a case ruling by Supreme court that Slave remains a property and that it cannot be a citizen of the Free state despite that Slavery is prohibited in the region.
Therefore, in conclusion, the timeline of the events identifies the process of extending slavery.
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