 After the war's end and the subsequent reoccupation of Lithuania by the Soviet Union, these Displaced Persons were allowed to immigrate to the United States and to apply for American citizenship thanks to a special act of Congress which bypassed the quota system that was still in place until 1967.The Displaced Persons Act of 1948 ultimately led to the immigration of approximately 36,000 Lithuanians.Before that, the nationality quota was only 384 Lithuanians per year.