What were the concerns about allowing or banning slavery in newly established territories during the 1800s?

must be 300 words.

must talk about the two sides of the decision to include new territories as either slave or free states, not the two sides of the slavery debate in general.

the answer is solomon northrup. he was a free-born african american, abolitionist and professional violinist that was drugged, kidnapped and sold as slave in 1841 and remained in captivity until 1853 where he regained his freedom with the of the then-governor of new york, washington hunt. he wrote and published his memoirs "twelve years a slave" in 1853, and in this text, he tells the story of his escape thru one of louisiana's swamps (the great pacoudrie swamp) in which he ended up covered in green slime from crossing the surface of the dead water.