Which most accurately explains the role played by debates over popular sovereignty in causing the civil war?       1. they convinced federal government to establish more colonies, that allowed slavery in order to maintain a balance between free and slave states.2. they prevented slaves from being used in northern factories.3. they lent credibility to the slave uprisings that the abolitionists support in an effort to start the beginning of the civil war.4. they led to arguments about the role citizens should play in determining the legality of slavery in their home states and territories.