The policy that allowed settlers in new territories to decide whether or not to allow slavery was called what?

The Kansas Nebraska Act of 1854 shattered whatever peace was gained by the Compromise of 1850. In addition to organizing the U.S. Territories of Kansas and Nebraska, the act attempted to deal with the extension of slavery into this region by allowing the settlers in each territory to decide the question for themselves. Hope That Helped

from the conditions of the working class in england by friedrich engels,the main idea is :

manchester's leaders hoped to oppress its working class to benefit factory owners.