Even if there were, it wouldn't be very useful. In a "common law" system like the US, legal questions are rarely answered purely by the plain text of a law. You also need case law - that is, how the law is typically applied in practice by the courts.

CourtListener (from the non-profit Free Law Project) provides bulk access to its case law collection.[1][2] I expect they are ingesting the GPO uscourts collection so it should have near complete (99%) coverage.[3][4]

[1] https://www.courtlistener.com/help/api/

[2] https://www.courtlistener.com/help/coverage/

[3] https://www.govinfo.gov/help/uscourts

[4] https://www.courtlistener.com/help/coverage/opinions/

The legislation seems more high-level requirements, that then implemented over in the Code of Federal Regs[1].

Using AI to plow through and make sense of all this would put us at risk of people knowing what the USG is getting up to.

[1] https://en.wikipedia.org/wiki/Code_of_Federal_Regulations

OpenAI, Anthropic, and Google are way ahead of you. Ask your heart away. I am unsure about open source models, it'd be interesting to know if they're ingesting the law.

Sure, then that with case law too?

Have at it!

The reality is that the official United States Code gives plenty of history for statutes, while the Code of Federal Regulations gives less but still basic history. Both are also provided in XML in bulk, though the former has a modern USLM format and the latter has an archaic schema. Case law is less amenable to git histories.

There was a project at Google Chicago to do something like that, around 15 years ago. For some reason, it was never launched.