Final answer:
The Internal Revenue Service (IRS) is the federal agency that can only perform administrative operations and not law enforcement operations on American soil.
Step-by-step explanation:
The federal agency that can only perform administrative operations and not law enforcement operations on American soil is the Internal Revenue Service (IRS). The IRS is responsible for enforcing tax laws and collecting taxes, but it does not have law enforcement authority like the other agencies listed. For example, the U.S. Air Marshals focus on protecting flights and passengers, the Central Intelligence Agency (CIA) operates overseas and conducts intelligence gathering activities, and the Federal Bureau of Investigation (FBI) is the chief federal law enforcement agency within the U.S. national borders.