Why did such a feeling of hatred and hostility develop among the northern and southern states through mid 1800s

What are new social classes emerged due to advancement in agriculture ?

Why might collective bargaining fail, causing a union to go on strike? a the union agrees with the boss about wages. b the boss compromises about work hours. c the factory goes out of business, causing the workers to lose their jobs. d the boss refuses to address dangerous working conditions in the factories.

What does the fall of the bastille represent? ?