Elections are run locally, not nationally
There is no national election authority in the United States. Elections are administered by states, and in most states delegated further to counties or municipalities. That is why ballot design, voting equipment, early voting rules and registration deadlines differ not just between states but between counties in the same state.
The federal role is narrower than commonly assumed: it sets floor requirements through statutes on voting rights, accessibility and registration, funds and certifies voting-system standards, and enforces civil-rights protections. It does not run elections or count votes.
Registration systems
Most states use a statewide voter registration database with local officials maintaining the records. Registration methods vary widely — online, by mail, at motor vehicle agencies, and in some states at the polling place on election day.
List maintenance is legally required and politically contested. Officials must remove voters who have died, moved out of jurisdiction, or become ineligible, while federal law restricts how and when removals may occur, particularly close to a federal election. Both an inaccurate list and an over-aggressive purge are failures of the same duty.
Counting, canvassing and audits
Election night results are unofficial. The official result comes from the canvass — a reconciliation of ballots cast against ballots counted, including provisional and lawfully-arriving mail ballots. The canvass takes days to weeks and the shift between election night and certified totals is an expected feature of it, not evidence of irregularity.
Most states now conduct post-election audits. A traditional audit rechecks a fixed percentage of precincts; a risk-limiting audit samples ballots until it reaches a statistical confidence that the reported winner is correct, examining more ballots when a contest is close and fewer when it is not.
Questions
Why do results change after election night?
Because election-night totals are unofficial. Provisional ballots must be adjudicated, lawfully-arriving mail ballots added, and the whole count reconciled during the canvass before certification.
Is there a single national voter roll?
No. Registration is maintained by states, most using a statewide database. Interstate data-sharing programs exist but participation is voluntary and no national roll exists.
What is a risk-limiting audit?
A method that samples ballots until there is a defined statistical confidence the reported outcome is correct. Close contests require examining more ballots; lopsided ones require fewer.
