Kravitz & Guerra
Federal law develops with the Constitution, which applies Congress the power to enact statutes certainly bounded aims like regulating interstate commerce. Nearly all statutes have been codified in the U. S. Code.
A lot of statutes apply executive branch offices the power to create regulations, which are issued in the Federal Register and codified into the Code of Federal Regulations.
Regulations typically also carry the force of law under the Chevron doctrine. A lot of lawsuits turn on the intending of a federal statute or regulation, and judicial versions of such meaning carry legal force under the principle of stare decisis.
In the first place, federal law traditionally centered areas where there was an express grant of power to the federal government in the federal Constitution, like the military, money, foreign affairs, tariffs, intellectual property (specifically patents and copyrights), and mail.