Final answer:
The number of documents required to show proof of residency varies, with voter registration often using a driver's license or state ID for verification, and citizenship requiring evidence of a lawful permanent residency for five years.
Step-by-step explanation:
When an applicant is showing proof of residency, the number of documents required can vary based on the context and specific requirements of the entity requesting the proof. In the context of voting registration, applicants must provide sufficient information to demonstrate residency, such as a driver's license or state identification card. If the registration is online and the applicant has government-issued documents, these are often used to cross-reference and verify residency. For individuals seeking citizenship, the residency requirement generally includes having resided in the United States as a lawful permanent resident for at least five years. However, specific document requirements for proving residency may change based on legislation, such as Arizona's law that required law enforcement to verify the citizenship of individuals suspected of being in the country illegally.