The election is required in our laws: https://www.law.cornell.edu/uscode/text/29/159 https://www.law.cornell.edu/uscode/text/29/159 Why it came to be that? I s

The election is required in our laws: https://www.law.cornell.edu/uscode/text/29/159 https://www.law.cornell.edu/uscode/text/29/159 Why it came to be that? I speculate that both existing unions and non-unionized businesses preferred the election accompanying single representative system, since it entrenches both. It preserves the status quo mostly, and gives power to existing unions that can run expensive election campaigns over a simple group of workers bargaining.