On March 6, 1820, President James Monroe signed the Missouri Compromise (also called the Compromise Bill of 1820) into law. The bill sought to make even the number of slave-holding states and free states in the nascent nation. It allowed Missouri to enter the Union as a slave state while Maine joined as a free state. What's more, the bill prohibited portions of the Louisiana Purchase territory north of the 36-degrees-30-minutes latitude line from engaging in slavery. Monroe, who was born into the Virginia slave-holding planter class, strongly supported states’ rights, but let Congress bicker over the issue of slavery in the new territories. He then closely examined any proposed legislation for its constitutionality. Although he realized that slavery ran contrary to the values written into the Constitution and the Declaration of Independence, he, like fellow Virginians Thomas Jefferson and James Madison, feared abolition would rip apart the country they had fought so hard to crea...