Mississippi River is the answer
Wilmer proviso would be the answer if that question
When will our conscious grow so tender that we will prevent human misery rather than that we will act to prevent human misery rather than advantage it
1. Missouri Compromise (allowed slavery in Missouri)
2. Kansas-Nebraska Act (made Kansas a territory free do decide on slavery)
3. Dred Scott (made black people property)
4. Fugitive Slave Act (forced north to cooperate with slave owners)
5. Bleeding Kansas (Missouri pro-slavery men invaded and terrorized Kansas to force slavery)
Missouri compromise was the beginning were it all started.