The USfg is only the powers derived from the constitution
Abdulghani 21 [Eman KB Abdulghani, Asmarya University, April 6, 2021, International Journal of Law, Justice and Jurisprudence, 2021; 1(2): 81-84, “The spirit of federalism in the US constitution”, E-ISSN: 2790-0681, //zrubin]
A federal structure derives its existence from the constitution, just as a company does from the grant that establishes it. “As a result, the constitution subordinates and controls all executive, legislative, and judicial powers, whether they belong to the national government or to individual states.” The constitution is the supreme law of the land in a federal state. Prof. Where says “that those two institutions – The supreme constitution and written constitution are then, essential institutions to a federal government. The supreme constitution is essential if the government is to be federal; the written constitution is essential if federal Government is to work well [20].”