Why did workers try to form labor unions in the late 1800s?

What was a result of the industrial revolution in the united states

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.

Plz the 10 places that charles darwin stopped at to report his findings, and include dates?