The federal government does according to the US Constitution Article 1, Section 8, Clause 3.
No, that is one of the Legislative Branch's (Congress) expressed powers under Article I of the Constitution.
Naturalization is regulated by the Executive Branch, through the Department of Homeland Security; the DHS naturalization agency is the U.S. Citizenship and Immigration Services (USCIS), not to be...
The FDA falls under the Department of Health and Human Services under the Executive Branch.
federal government