How do forces beyond workers control affect union memebership

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Explanation:

All workers benefit from unions because unions set pay standards and workplace protections. Union members — workers like you — benefit most from the union's collective bargaining power to negotiate with employers on their behalf. Union workers are more likely to have guaranteed pensions than non-union employees.

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a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

b]to spread the message of black power