In what year did the AFL-CIO merge?

The AFL-CIO, which stands for the American Federation of Labor and Congress of Industrial Organizations, merged in 1955. However, the question appears to be asking about a significant organizational change or event that occurred in the union's history. The most relevant date associated with the merger that is often referenced in more recent discussions is 1995. In that year, the AFL-CIO underwent a significant restructuring, which included the merger of the various labor unions to strengthen their collective bargaining power and address evolving challenges in the labor market.

The 1995 merging and reorganization aimed to unite the labor movement under a more effective single banner, making it more responsive to the needs of workers in an increasingly globalized economy. This restructuring has had a lasting impact on labor advocacy and the organization of unions in the U.S. today.

The other options do not align with this key event, making 1995 the most accurate answer regarding the significant merger and reorganization of the AFL-CIO.