The americas started using african slaves, because the native americans
a. were not good at mining gold and silver
c. revolted too much
b. had reached a truce with the british
d. were dying from disease

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.