What contributed to the decline in union power and membership?
a.
a belief that “big labor” had become corrupt, fueled by republican rhetoric.

b.
automation and relocation of manufacturing plants.

c.
racism in the working class combined with a lack of political support for unions as democrats began to think that individual failure rather than systemic failure led to poverty.

d.
all of the above.

A - a belief that 'Big labor' had becom corrupt, fueled by Republican rhetoric.

Explanation:

In the beginning, labor unions fought for the rights of the workers (more pay, better/safer work conditions). Over time some of them have become corrupt, making more money for themselves than the workers - this led to a suspicion that all unions were corrupt, leading to a decline in membership and therefore power.

the reform movements that arose during the antebellum period in america focused on specific issues: temperance, abolishing imprisonment for debt, pacifism, antislavery, abolishing capital punishment, amelioration of prison conditions (with prison's purpose reconceived as rehabilitation rather than punishment), the humane treatment of animals, the humane and just treatment of native americans, the establishment of public institutions for the care of the destitute, orphans, blind, and mentally ill, the establishment of public schools, the abolition of tobacco use, vegetarianism, health reform, homeopathic medicine, woman's rights (including, at first, especially the establishment of a woman's right to own property apart from her husband and her right to sue for divorce), and the amelioration of labor conditions (including higher pay, the right to form unions, the right to strike, and the demand for limits on the number of work hours, and safe working conditions).

explanation: