Because the Scientific Revolution and the Reformation Era had not happened yet and people blindly followed the church's teachings.
Lincoln worried about resupplying fort Sumter because he thought it would provoke war (which it did), since the Southerners would view this as a federal intrusion.
Answer:
The repeal of the Missouri Compromise lead to the formation of the anti-slavery Republican party. ... With it, the country was equally divided between slave and free states. Admitting Missouri as a slave state gave the south one more state than the north. Adding Maine as a free state balanced things out again.
Explanation: