Perhaps the most important part about munn v. Illinois was that the Supreme Court of the United States upheld the federal government's right to regulate private industry, since this had been a contested issue for a long time.
The Louisiana purchase in the eyes of some federalist was the gateway the "common and the frontier people" would need to usurp their political ideology. political parties were never part of the founding father's plans, however they were quickly becoming a fact of life in the united states.
While there was slavery in the past in European nations as well, it wasn't as rampant as it was in the United States where there were a lot of plantation owners who also owned multiple slaves and whole families at times - before this was made illegal during the US civil war.
The Underground Railroad was were slaves would travel through when they left there slaves owner after escape there owner to be free
Some context would be nice