Federal Register
The daily journal of the US government, where agencies publish proposed and final rules, notices, and presidential documents.
The Federal Register is the official daily publication of the United States government. Almost everything an agency does that affects the public appears here first: a proposed rule, the final rule that follows it, a notice, or a presidential document. If a change is not in the Federal Register, in most cases it has not legally happened yet.
It matters to a reader for a practical reason as well as a legal one. As a work of the United States Government it carries no copyright, so its text can be quoted at length, restructured, and explained - which is why coverage of a rule can be anchored to the rule itself rather than to somebody else's summary of it.
The Federal Register publishes the document; the Code of Federal Regulations is where the resulting requirement lives permanently. A rule is news when it publishes, and law when it is codified.
What the federal government did, once a day.
One email each weekday: the rules, filings, votes and Fed decisions that actually changed something, each one linked to the document it came from.