グリーンカード
A green card, known officially as a permanent resident card, is an identity document which shows that a person has permanent residency in the United States. Green card holders are formally known as lawful permanent residents (LPRs). , there are an estimated 13.9 million green card holders of whom 9.1 million are eligible to become United States citizens. Approximately 65,000 of them serve in the U.S. Armed Forces.