False John brown was going against the southerners
The result is, Native Americans were eager to use the railroads for travel.
Extreme pro-slavery elements objected to it because it provided a precedent by which Congress had power to regulate slavery. Abolitionists opposed it because it allowed slavery to continue to spread in some of the areas.
I’m not sure how to answer this question
A person who believed in 'popular sovereignty' would believe that each territory should decide whether it becomes a free or slaveholder state.