Argentine Antarctica mainland. Argentina was the only nation to have an Antarctic base for 40 years until the British built a base on the same islands. Argentina bases its claims on this sector of Antarctica on the following grounds: Argentina's claim to the Antarctic Peninsula overlaps with the Antarctic claims of Chile, 53°W to 90°W, and the UK claims, 20°W to 80°W. Currently, there are no attempts by Argentina or any other country to enforce territorial claims in Antarctica. See List of Antarctic territorial claims. None of these claims have international recognition and have been suspended by the Antarctic Treaty in 1961.
Permanent Joint Board on Defense of the United States and Canada. The board, which is co-chaired by a Canadian and an American, meets semi-annually, alternating between either country. The joint board is similar to several entities formed earlier by the two countries. In 1909 they formed the International Joint Commission, which by 1940 had successfully resolved issues regarding waters along the Canada–United States border; another was the International Pacific Salmon Fisheries Commission. Such bodies' success likely influenced the design of the Permanent Joint Board on Defense. Permanent Joint Board on Defense The Permanent Joint Board on Defense (spelled Defence in Canadian English) is the senior