위키피디아에 나온 글인데요…

여기보면 re-entry를 신청하지 않더라도 365일 안에 미국에 들락거리면 유지가 된다는 것 같은데요… 예전에 한국서도 보면 영주권 있는 사람들이 유지를 위해 1년에 한번씩 들락거리는걸 많이 봤는데, 요즘은 그게 아니란 말인지요? 법적으로 이민국에서 이렇게 알려줬다면 사실 소송해도 되는 사항 아닌가요?

Abandonment or loss of permanent residence status

A green card holder may abandon permanent residence by filing form I-407, with the green card, at a U.S. Embassy.^[35]

Under certain conditions, permanent residence status can be lost involuntarily. This includes committing a criminal act that makes a person removable from the United States. A person might also be found to have abandoned their status if he or she moves to another country to live there permanently, stays outside the USA for more than 365 days (without getting a re-entry permit before leaving),^[36] or does not file an income tax return. Permanent resident status can also be lost if it is found that the application or grounds for obtaining permanent residence was fraudulent. The failure to renew the permanent resident card does not result in the loss of status, except in the case of conditional permanent residents as noted above.

A person who loses permanent residence status is immediately removable from the United States and must leave the country as soon as possible or face deportation and removal. In some cases the person may be banned from entering the country for three or seven years, or even permanently.