The US Constitution is the founding document of the United States Government. It establishes the 3 branches of government: the legislative branch, the executive branch, and the judicial branch.
Annotated versions of the US Constitution are available at the following locations:
Statutes are laws made by the Legislative Branch at both the Federal and the State level.
Regulations are laws created by administrative agencies of the Executive branch. Here is a list of all US administrative agencies.
Cases are laws made by the Judicial Branch. For the Federal court system, there are trial level courts (District Courts), appellate level courts (Circuit Courts of Appeal), and a supreme court (The United States Supreme Court). For additional information regarding the US Court System, please visit the United States Courts' website.