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The 1930s were a period of international rivalry in Antarctica, and the map was cut into wedgelike territorial claims that in some places overlapped. Although the U.S. government did not make a claim or recognize those of other nations, it supported antarctic exploration. The Antarctic Treaty (1959) which now has 46 member nations, did not end national claims to Antarctica, and in the 21st cent. claimant nations extended their claims over the continental shelf offshore to the maximum (350 nautical mi) allowed by international law.
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