Doyle,

"With the United States Supreme Court striking down the 1820 Missouri Compromise, Which had established the admission of States to the Union as either a slave State or a free State based upon an arbitrary line drawn across the United States map, as being unconstitutional, Northern States such as Kansas could then decided where they wish to enter the Union as Slave States. Hence Bleeding Kansas and John Brown."

Which Supreme Court decision are you referring to here? The Missouri Compromise was repealed by Congress in 1854 with the Kansas-Nebraska Act and its doctrine of "popular sovereignty."