Which of these does NOT help to explain the trend of declining union membership?

Name: Which of these does NOT help to explain the trend of declining union membership?
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Question

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The reduction in wages in manufacturing due to offshoring does not directly explain the decline in union membership. Instead, it is more related to the loss of manufacturing jobs, which traditionally had higher unionization rates. The other options directly relate to factors that have contributed to the decline in union membership.

Which of These Does NOT Help to Explain the Trend