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While the United States has had Antarctic interests since the continent's discovery in 1820, it did not establish any Antarctic colonies until the fall of Russian Antarctica in the early 20th Century.
American Antarctic possessions:
- American Antarctic Zone — 1918-1922
- Not an official political entity. An area of former Russian land which was under the direct administration of the United States Military.
- Byrdia — 1922-1986
- Palmeria — 1922-1978
- South Pole — 1950
Countries in a Compact of Free Association with the United States:
- Byrdia — 1986-present