Which nation claims ownership of Antarctica?

No nation claims ownership of Antarctica. The continent is governed as an international territory under the Antarctic Treaty System, which was signed in 1959 by 12 countries. The treaty, which now has 54 parties, prohibits any military activity, mineral mining, and nuclear testing in Antarctica. Instead, it promotes scientific research, peaceful cooperation, and the protection of the environment. While some countries have made territorial claims in the past, these are currently suspended and put on hold in accordance with the treaty, effectively establishing a collective international management of Antarctica.