How did Lincoln refine the concept of unity over in his First Inaugural speech?

Lincoln refined the concept of unity over in his First Inaugural speech by his promise to not interfere with certain institutions in certain parts of the country such as that of Slavery. He promised to allow things remain that way in parts which supported slavery and parts which opposed it.

He however maintained a very firm stance against secession and the seizure of federal property.

which time period is this? or is this story fictional, i'm going to need more info to answer this question

a.

congress passed laws allowing for free passage between states.