The majority of federal immigration statutes can be found in the Immigration and Nationality Act (INA), which is codified in Title 8 of the U.S. Code. The Act was enacted in 1952, has been amended many times since then, and provides the basic structure for the governance of immigration to and citizenship in the U.S. Public access to codified Act in Title 8 is linked above, and the law can also be found on Lexis and Westlaw.
Other immigration-related statutes can be found in the U.S. Code, in Title 6 (Domestic Security), Chapter 69 of Title 18 (Crimes and Criminal Procedure - Nationality & Citizenship), Title 22 (Foreign Relations), and Title 29 (Labor). Public access to these Titles are linked above, and the U.S. Code can also be found on Lexis and Westlaw.
Immigration regulations can be found in the Code of Federal Regulations (CFR), in Title 8 (Aliens and Nationality), Title 22 (Foreign Relations), and Title 29 (Labor). Public access to these Titles are linked above, and the CFR can also be found on Lexis and Westlaw.