Discuss how the following rights could help improve sweatshop conditions: Joining an independent (not state-controlled) union
Engaging in collective bargaining with an employer
Conducting a legal strike (work stoppage)

Workers who have organized into unions have much more power to make changes than workers acting on their own. This power can be used through collective bargaining to negotiate improved wages and working conditions. The option of calling a legal strike, should negotiations fail, makes it much more likely that worker demands will be met.

it further strained relations between the north and the south and convinced

i believe the answer would be 1.