Why would slavery be an issue when the United States added these new territories ? How did this contribute to the growing tensions in the United States ?

The compromise lasted until the passage of the Kansas-Nebraska Act in 1854, when Illinois Senator Stephen Douglas proposed legislation allowing the issue of slavery to be decided in the new territories. ... Once the transatlantic slave trade was prohibited, domestic slave trading throughout the South increased.

Explanation:

c  

explanation:

small european communities with shared traditions consolidated into large new states (apex)