The year of 1820 in the U.S. was a little crazy. The U.S. had just bought itself the Louisiana territory had just been purchased and slave states wanted to expand their farm land so they could grow and sell more cotton. The last thing that the Northern states wanted was to have slavery expand or even stay. Also the Northern states didn’t want the slave states to rule in the House.
Congress needed to think fast they before the slaves states dominated the new territory. They decided to draw line 36, 30. A line that splitted up the U.S. into two pieces. Anything above this line in the new territory was to be Free and anything below was to be could become a slave state.
After this was passed it didn’t take to long for people to start to realize how unreasonable and unconstitutional this was. so the decided to stop the 30,36 line.