Final answer:
The service sector is the most important sector of the U.S. economy, contributing significantly to the GDP and employing a large portion of the workforce.
Step-by-step explanation:
The most important sector of the U.S. economy is the service sector. Services, such as healthcare, education, and legal and financial services, make up the largest part of the U.S. GDP. Services have been a growing share of GDP over time.
Manufacturing, while still significant, accounts for a smaller portion of the GDP compared to the service sector.
In summary, the service sector is the most important sector of the U.S. economy, contributing significantly to the GDP and employing a large portion of the workforce.