• Union membership grows in 1955, why?

Labor unions in the United States are organizations that represent workers in many industries ... Union membership in the private sector has fallen to 6.2%, one fifth that of ... In 1955, the two largest labor organizations, the AFL and CIO, merged, ... After 1960 public sector unions grew rapidly and secured good wages and ...

Explanation:

They were highly successful so it grew

the answer is c, all the other options are things they are known for.

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