What time period in U.S. history do we generally recognize as the peak of labor union membership?

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The peak of labor union membership in the United States is generally recognized as the period between the 1940s and the 1970s. During this period, there was a strong push for workers' rights and union membership increased significantly, as labor unions were successful in negotiating better wages, benefits, and working conditions for their members. However, since the 1970s, union membership has been in decline, largely due to changes in economic conditions and anti-union legislation.

What Time Period in U