While we're on the topic, I want to remind people that Marie Byrd Land isn't "unclaimed" or no man's land, it's American 🇺🇸. Admiral Byrd and Lincoln Ellsworth both claimed the region on behalf of the US, but Congress has yet to formally recognize their claims.
American activity on the continent goes all the way back to 1820, when American sealer Nathaniel Palmer of Stonington, Connecticut, discovered the Antarctic Peninsula. Another American sealer, John Davis was likely the first man to have set foot on Antarctica.