What was the conflict between these to laws?

Question

What was the conflict between these two laws?
Missouri Compromise
and the Kansas-Nebraska act

Answer 1

The Kansas-Nebraska Act of 1854 created the territories of Kansas and Nebraska and opened new lands for settlement, and allowed the settlers to decide whether or not to have slavery

The Missouri Compromise, also called the Compromise of 1820, was an agreement passed in 1820 between the pro-slavery and anti-slavery factions in the United States Congress, involving primarily the regulation of slavery in the western territories. It prohibited slavery in the former Louisiana Territory north of the parallel 36°30' north except within the boundaries of the proposed state of Missouri.