How did imperialism, nationalism, and multilateralism contribute to making this a world war

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 were some of the new consumer appliances that americans could purchase in the 1920s

What deadly disease cost many workers their lives before dr. william gorgas found a treatment?