Final answer:
The history of collective bargaining in the United States is correlated with the passage of the National Labor Relations Act in 1935 and the Taft-Hartley Act of 1947.
Step-by-step explanation:
The history of collective bargaining in the United States is closely correlated with several historical events. One significant event is the passage of the National Labor Relations Act in 1935, which legalized the labor movement and granted workers the right to form unions and engage in collective bargaining. Another important event is the Taft-Hartley Act of 1947, which gave states the power to allow workers to opt out of unions.