Final answer:
A current trend in U.S. union-management relations is the decline in union membership attributed in part to U.S. laws such as the Taft-Hartley Act that allow workers to opt out of unions.
Step-by-step explanation:
One current trend in union-management relations in the United States is the steady decline of union membership since the 1950s. A key factor contributing to this decline may be U.S. laws that are perceived as unfriendly to union formation compared to those of other countries. The National Labor-Management Relations Act of 1935 once encouraged a significant increase in unionization by granting workers the right to organize; however, the Taft-Hartley Act of 1947 introduced the option for workers to opt out of unions, creating a less encouraging environment for union growth. These legislative changes, along with public perceptions of unions as both protectors of workers' rights and potential 'troublemakers,' play a role in shaping the current union landscape.