It was acquired by the United States through a treaty in 1877 .
The chief of Pago Pago signed a treaty with the U.S. in 1872 , giving the American government considerable influence on the island .
Pago Pago was acquired by the U.S.   through a treaty in 1877 .
The chief of Pago Pago signed a treaty with the U.S. in 1872 , giving the American government considerable influence on the island .