Since no one 'owns' any part of Antarctica, it's possible to answer your question by stating that McMurdo Research Station has always been funded by the United States of America, beginning in about 1956.
However, in the early 1900s, Sir Robert Falcon Scott -- a British Citizen -- established a hut there -- Hut Point -- that sheltered several expeditionary teams.
As well, James Clark Ross discovered the geography in February 1841. McMurdo is named after one of his crew.
The New Zealand Scott Base Station is about three kilometers from McMurdo Station.
McMurdo Station covers about one square kilometer.
McMurdo Station is about one square kilometer in size.
The McMurdo Research Station is found in/on the continent of Antartica=D
People who live and work temporarily at McMurdo are scientists or people who work in support of science. Note that McMurdo Station is Antarctic in the southern hemisphere.
The United States of America supports three research stations on the Antarctic continent: McMurdo Station, Amundsen-Scott South Pole Station, and Palmer Station.
McMurdo Station is located on the southern tip of Ross Island, which is in the New Zealand - claimed Ross Dependency on the shore of McMurdo Sound in Antarctica.
McMurdo Station is supported by the United States of America, through the National Science Foundation.
McMurdo is not a colony. McMurdo is a science research station developed by the United States of America.
McMurdo Station was established by the United States on February 16, 1956.
McMurdo Research Station was founded by the United States of America.
The McMurdo Station is located at about 77 degrees, 50 minutes South. You were asking a redundant question that had already been answered. Just search for all questions concerning "McMurdo".