Final answer:
The service sector comprises approximately 80 percent of all jobs in the United States, reflecting the shift from a manufacturing-based to a service-based economy.
Step-by-step explanation:
The service sector makes up a crucial part of the United States economy and employment. Specifically, the service sector accounts for approximately 80 percent of all jobs in the United States. This significant employment figure signifies the transition of the U.S. economy from a manufacturing-focused system to a predominant service-based economy. This shift is reflected in the considerable growth in service jobs over the past few decades, with jobs in manufacturing peaking in the late 1970s and declining since then, while service job numbers have increased dramatically.
This transformation indicates that the U.S. has become a postindustrial service economy, particularly with the rise of the information age. Service sector jobs can vastly differ in pay; some offer high wages and prosperity, whereas others are low-paying, contributing to economic bifurcation and the widening wealth gap.