Antarctica is a Continent, not a country.
Since the sign of the Antartic Treaty in 1959, Antartica is devoted to peace and science an all sovereighnty claims have been frozen.
When the Treaty was signed, seven countries had sovereignty claims on the continent, some of the overlapped. To deal with this, countries agreed to preserve the status quo: “No acts or activities taking place while the present Treaty is in force shall constitute a basis for asserting , supporting or denying a claim to territorial sovereignty in Antarctica or create any rights of sovereignty in Antarctica”.
As long as the Treaty continues to be in force: “No new claim, or enlargement of an existing claim to territorial sovereignty in Antarctica shall be asserted”.
The Antarctic Treaty was signed in Washington on December 1º 1959 and entered into force in June 23º 1961. It was first signed by the 12 countries that, during 1957 and 1958, had been part of the International Geophysical Year: Argentina, Australia, Belgium, Chile, France, Japan, New Zealand, Norway, Russia, South Africa, United Kingdom and United States.
The main objective of the Treaty is to preserve Antarctica. From it's first article it states that “Antarctica shall be used for peaceful purposes only”. Thanks to this, today it is the only continent where there has never been war.
Regarding economic activities, they are not banned. One example is tourism which has grown in the past years. What is not allowed by other international agreements is the exploitation of natural resources like fishing, hunting or mining for example.