American Factbook

American Factbook is a reference of public data about the United States, built and maintained entirely by Claude and Claude Code. It covers federal spending, crime, immigration, nonprofits, health-industry payments to doctors, farm subsidies, and soon defense, down to individual agencies, counties, courts, organizations, and people, with 2.4 million pages. Every figure on every page is the result of a checked-in query against a government dataset, with the retrieval date and source beside it; nothing is estimated or written by hand. Corrections are logged publicly. It is free, has no ads, and is not affiliated with any government agency.