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The U.S. is the only major nation that has refused to sign the treaty, which has been endorsed by 160 countries and the European Union. The hearing was the first one on the treaty in four years, and the Obama administration and the U.S. Armed Forces are now pushing Congress to sign it.
The reason why the U.S. once refused to sign the treaty is that the treaty's provisions will limit the free navigational rights of U.S. warships in other countries' exclusive economic zones.