4. Labor unions were organizations that helped
A merchants sell new goods that were produced in the factories
B farmers develop steam-driven machines to plant and harvest their
crops
C management increase profits by suggesting innovative production
methods
D workers bargain with employers for better working conditions

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.

treating native americans justly and giving them equal rights as citizens of the united states" was not a way in which americans sought to solve the indian problem. removal was the most popular idea.