"Although an instrument of the US Government, the Federal Reserve System considers itself "an independent central bank because its monetary policy decisions do not have to be approved by the President or anyone else in the executive or legislative branches of government, it does not receive funding appropriated by Congress, and the terms of the members of the board of governors span multiple presidential and congressional terms."[26]" [Wikipedia]
So, to my knowledge, USA is not Fed aka Federal Reserve or Federal Reserve System
==============================================
The national debt level of the United States (or any other country) is a measure of how much the government owes its creditors. The U.S. national debt reached a record of $24.22 trillion in April 2020. [google]
==========================================
Who does the US owe money to?
The public holds $19.7 trillion, or 77%, of the national debt. 1 Foreign governments hold about a third of the public debt, while the rest is owned by U.S. banks and investors; the Federal Reserve; mutual funds; state and local governments; and pensions funds, insurance companies, and savings bonds.[google]