Final answer:
Voter registration is required for individuals to vote in federal elections in the US. It allows the government to determine eligibility to vote and select party nominees. Specific requirements vary by state.
Step-by-step explanation:
Voter registration is required for an individual to cast a ballot in any federal election in the United States. It allows the government to determine which citizens are eligible to vote and from which list of candidates they may select a party nominee. The specific voter registration requirements vary from state to state, but most require a minimum length of residency, a declaration of US citizenship, and registration at least 30 days before the election.