Hillary Clinton may have turned against the negotiated, unratified 12-nation Trans Pacific Partnership to fend off Mr. Sanders, but is unlikely to flip back.

Among the unratified pacts signed by a U.S. president is the 1996 Comprehensive Test Ban Treaty, which bans all nuclear explosions.

A treaty that might help remains unratified The "most notable" disputes are those involving claims to extend countries' outer continental shelves under the U.N.