The table also indicates the historical party composition in the:
- Territorial Senate
- Territorial House of Representatives
- Territory delegation to the U.S. House of Representatives
For a particular year, the noted partisan composition is that which either took office during that year or which maintained the office throughout the entire year. Only changes made outside regularly scheduled elections are noted as affecting the partisan composition during a particular year. Shading is determined by the final result of any mid-cycle changes in partisan affiliation.
- Acting commandant.
- Commandant/governor; from 1904 to 1980, governors were appointed by the United States government.
- 17 July 1911: U.S. Naval Station Tutuila renamed American Samoa.
- Acting governor.
- On February 20, 1929, the U.S. Congress recognized of the cession of Tutuila and Manu'a by their chiefs, retroactive to 16 July 1904.
- Military governor.
- Beginning in 1980, governors have been elected for 4-year terms by the people of American Samoa.