Why did the conflict between the northern and southern states deepen as territories from the louisiana purchase apply for statehood?

The main conflict that North and Southern states were the questionable slavery and the laws of tariffs proposed. The southern wanted to continue the act of slavery, by continuing to important and use slaves. While the North had wanted to ban slavery. There was also conflict after the revolutionary war, that the people had a hard time living and had to steal in order to live.