tl;dr: The author built a Git-like version control system for the US Code, replaying public laws' amending instructions between release points from 2017 onward to reconstruct the text in force on any given date, with each phrase attributed to the Act that wrote it. Of 365 changes across nine titles, 361 reproduced the next release point exactly. The motivation is partly that LLMs struggle with temporal validity in statutory interpretation—applying superseded rules or preferring newer provisions when older ones govern—and a checkable history of statutory text is needed to ground legal research.