
Americans affirmed their independence with the ringing declaration that “all men are created equal.” But some of them owned African slaves, and were unwilling to give them up as they formed new federal and state governments. So “to form a more perfect union” in 1787, certain compromises were made in the Constitution regarding slavery. This settled the slavery controversy for the first few decades of the American republic, but this situation changed with the application of Missouri for statehood in 1819.

Interactive map illustrating the geography, demography, and political division of the United States as a result of the Missouri Compromise over the issue of Slavery in 1820–21