During the 1850s, what congressional action led to sectional tensions and the formation of a new political party

Which would make the best heading for this list of notes about the migration of african-americans during the reconstruction era?

Which of the following arguments decided the debate over using the atomic bomb against japan in 1945? using the bomb would destroy the armaments still available to japanese forces in japan. using the bomb would demonstrate the power of the united states to the entire world. using the bomb would shorten the war and avoid heavy casualties among invading troops. using the bomb would enable allied forces to invade and take over the japanese mainland

How long was the peasants’ work day?