If taking about Dred Scott, it might be said that he sued for his freedom but lost. He was a slave and his freedom was denied even though he lived in a free territory.
-Solomon Northrup was a back freedman who lived in New York. He was capture and sold into the New Orleans slave market.
-Roger B Taney repealed effectively the Missouri compromise.
The continual flow of the free market is driven by self interest and competition.
Where is the text? Need more information
This is false. Like most European countries, France was most interested in the import and trade of things like tobacco and sugar.