What is a example of service provided by federal government?

Federal highways -- U.S. and the interstate routes

Defense
International relations
Supreme Court's decisions about the Constitutionality of laws
Social Security
Medicare and Medicaid
Administers pure food and drug laws

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An example of a service provided by the federal government is the United States Postal Service (USPS). The USPS is responsible for delivering mail and packages, providing postal services to individuals and businesses across the country. To find this information, one can generally look up the services provided by the federal government on official government websites or through government publications. In the case of the USPS, you can go to the USPS website or search for "services provided by USPS" on search engines, which will lead you to the official information about the postal service.