U.S. Code as Git Repo: Track Legal Changes with git diff

The United States Code is now available as a Git repository containing every title, chapter, and section of federal law stored as Markdown files. Each commit corresponds to an Office of the Law Revision Counsel (OLRC) release point, providing point-in-time snapshots of federal law from 2013 to present.

Repository Structure and Contents

The repository contains 53 titles of the United States Code with approximately 2,950 chapter-level Markdown files and 60,400 sections with full statutory text. The data is organized in a directory structure like:

uscode/
├── title-01-general-provisions/
│   ├── _title.md
│   ├── chapter-001-rules-of-construction.md
│   └── ...
├── title-02-the-congress/
├── title-03-the-president/
└── ...

Each Markdown file includes YAML frontmatter with metadata (title number, chapter, heading, section count, source URL) and the full statutory text with cross-references, statutory notes, and amendment histories.

Git Commands for Legal Analysis

Developers can use standard Git commands to analyze legal changes:

git diff congress/115..congress/116 --stat - See what changed between the 115th and 116th Congress
git diff annual/2019..annual/2025 -- uscode/title-18-crimes-and-criminal-procedure/ - Full text diff of Title 18 between 2019 and 2025
git log --oneline -- "uscode/title-18-crimes-and-criminal-procedure/chapter-044-firearms.md" - See when a specific section was last modified
git diff annual/2013..annual/2025 --stat | tail -1 - Count files changed across the 12-year history

Tags and Historical Points

The repository includes tags for specific Congress sessions and years:

annual/2013 - 113-21 (2013, earliest available OLRC snapshot)
congress/113 - 113-296 (2014, end of 113th Congress)
annual/2015 - 114-38 (2015)
congress/114 - 114-329 (2017, end of 114th Congress)
annual/2017 - 115-51 (2017)
congress/115 - 115-442 (2019, end of 115th Congress)
annual/2019 - 116-91 (2019)
congress/116 - 116-344 (2021, end of 116th Congress)
annual/2021 - 117-81 (2021)
annual/2022 - 117-262 (2022)
congress/117 - 117-262 (2022, end of 117th Congress)
annual/2024 - 118-158 (2024)
congress/118 - 118-158 (2024, end of 118th Congress)
annual/2025 - 119-73 (2025, current latest)

Limitations

Coverage starts in 2013 as OLRC XML release points are only available from the 113th Congress onward. The repository contains codified law only (the consolidated United States Code), not individual bills or public laws in directive format. Not all titles are positive law - some titles are "evidence of law" rather than the legal text itself. Appendix titles (5A, 11a, 18a, 28a, 50A) are not yet included, and 6 sections across titles 5, 10, 25, 28, 38, and 40 have duplicate section numbers in the source XML.

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