Answer:
According to the controversial political doctrine, the people of federal territories should decide for themselves whether their territories would enter the Union as free states or whether their territories would enter the Union as slave states.
Step-by-step explanation:
People of a state can decide whether to allow slavery themselves or not. A line is drawn such that states above the line are free states and states below that line are slave states.
According to the controversial political doctrine, the people of federal territories should decide for themselves whether their territories would enter the Union as free states or whether their territories would enter the Union as slave states.