Answer: The constitution failed to deal with slavery, expansion, and regional conflict which contributed to the failure of the Union.
Step-by-step explanation:
Sectional differences in the United States throughout the 1850s spread farther, as the political authorities argued about slavery and whether or not should be allowed to be extended, while the abolition movement grew in some free states.
The Fugitive Slave Act, the Kansas-Nebraska Act and the Supreme Court's decision in Dred Scott vs Sandford turned Northerners to think that, against the Constitution, slavery was dominating government.
On the other side, white Southerners also believed the Constitution was on their side, as the Northern efforts to restrain slavery constituted an attack on their freedom.