Final answer:
Unionization is declining due to the transition from manufacturing to service industries, increased global competition, and the reduced necessity of unions because of workplace protection laws.
Step-by-step explanation:
Unionization is declining with the overall rates of union membership and intense competition in global markets. This trend is attributed to several factors. A primary factor is the shift from manufacturing to service industries, where union activity has historically been less prevalent.
Another key explanation for the decline in unionization rates is the force of globalization and the increase in competition from foreign producers.
For instance, U.S. automakers and steelmakers have faced significant challenges from Japanese and European manufacturers, leading to job losses in sectors that were once heavily unionized, such as the United Auto Workers (UAW).
Lastly, there is a reduced desire for unions due to the presence of workplace protection laws that provide some of the benefits and safeguards previously secured through union negotiations. Moreover, the U.S. legal environment makes it relatively more difficult for unions to organize workers and expand their membership.