When did the United States establish a naval station at Pago Pago Harbor?

The United States signed a treaty in 1878 to establish a naval station at Pago Pago Harbor in American Samoa. While the site was initially selected in 1872 by Commander R.W. Meade to secure coaling facilities, the formal treaty agreement followed six years later. The harbor subsequently served as an active U.S. Navy base from 1900 to 1951.123