Someone please help me with this

Who issued the ruling for the supreme court? dred scott roger b. taney abraham lincoln john c. calhoun

Brainliesttt !me : ) describe the event : increase in islamic extremis in the middle east

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.