A lawful permanent resident can apply for United States citizenship, or naturalization, after five years of residency. This period is shortened to three years if married to a US citizen, or four years if permanent residency was received through asylum. Lawful Permanent Residents may submit their applications for naturalization as early as 90 days before meeting the residency requirement. Citizens are entitled to more rights (and obligations) than permanent residents (who are still classified as aliens in this respect). Lawful Permanent Residents generally do not have the right to vote, the right to be elected in federal and state elections, the ability to bring family members to the United States (permanent residents are allowed to sponsor certain family membres, but this is often not practical due to long approval delays),or eligibility for federal government jobs. Male permanent residents between the ages of 18 and 26 are subject to registering in the Selective Service System. Permanent residents who reside in the US must pay taxes on their worldwide income, like US citizens.
