Select the items that explain why labor unions were needed

Which would make the best heading for this list of notes about the migration of african-americans during the reconstruction era?

What were 3 advantages to rail road growth

Pls thomas jefferson believed that the french revolution and the reign of terror, a. should be exported to the rest of europe. b. would bring the united states and britain closer together. c. we’re understandable yet regrettable responses to the excesses of french monarchy. d. we’re not particularly important developments.