Final answer:
The option 'Rank and file disagreement with union leadership' is not a major factor in causing strikes. Major strike causes relate to conflicts between workers and management over issues like wages and working conditions, rather than internal union disputes.
Step-by-step explanation:
The question asks which one of the listed factors is not a major cause of strikes. The major factors that could cause a strike include: a) Employees feeling that wages should be higher, b) Reduction in benefits, c) Misperception between bargaining parties, d) A unilateral change by management. Therefore, the option that is not a major factor for causing a strike is b) Rank and file disagreement with union leadership, as the major reasons for strikes historically involve direct conflicts between workers and management rather than internal union disagreements.
Exploring the history of labor disputes, particularly postwar America, poor working conditions, income inequality, and low wages led to frustration and a surge in strikes. The new legislation concerning work conditions passed after strong political support from labor unions ironically made some workers feel less dependent on unions. Cultural differences and the share of unionized workers also contribute to the dynamics of labor movements.