Typically, legislative history questions arise when there is some ambiguity with regards to a particular section of the U.S. Code and the courts have not addressed it.
In order to answer those questions, we must turn to the documents that created that particular piece of legislation.
An annotated USC will offer a historical note at the end of each section (derivation note) that provides the history of that particular section.
Most importantly, you will find a reference to the Public Law Number and Statutes at Large citation, which you will use as your access points.
When a bill is signed into law by the President it is sent to the Office of the Federal Register to be assigned a law number, paginated for the United States Statutes at Large, and prepared for publication as a slip law.
Note: A slip law is an official publication of the law and is "competent evidence," admissible in all state and Federal courts and tribunals of the United States (1 U.S.C. 113)
At the end of each session of Congress, the slip laws are compiled into bound volumes called the Statutes at Large, and they are known as "session laws".
A few words about the Statutes at Large:
Where to find:
University of Cincinnati Libraries
PO Box 210033 Cincinnati, Ohio 45221-0033